diff --git a/osu.Game.Rulesets.Catch/Objects/JuiceStream.cs b/osu.Game.Rulesets.Catch/Objects/JuiceStream.cs
index d32595c2e1..7c8d57e689 100644
--- a/osu.Game.Rulesets.Catch/Objects/JuiceStream.cs
+++ b/osu.Game.Rulesets.Catch/Objects/JuiceStream.cs
@@ -115,15 +115,15 @@ namespace osu.Game.Rulesets.Catch.Objects
             }
         }
 
-        public double EndTime
+        public float EndX => X + this.CurvePositionAt(1).X / CatchPlayfield.BASE_WIDTH;
+
+        public double Duration
         {
-            get => StartTime + this.SpanCount() * Path.Distance / Velocity;
+            get => this.SpanCount() * Path.Distance / Velocity;
             set => throw new System.NotSupportedException($"Adjust via {nameof(RepeatCount)} instead"); // can be implemented if/when needed.
         }
 
-        public float EndX => X + this.CurvePositionAt(1).X / CatchPlayfield.BASE_WIDTH;
-
-        public double Duration => EndTime - StartTime;
+        public double EndTime => StartTime + Duration;
 
         private readonly SliderPath path = new SliderPath();
 
diff --git a/osu.Game.Rulesets.Osu/Objects/Slider.cs b/osu.Game.Rulesets.Osu/Objects/Slider.cs
index 6ba0e1c6aa..984a9bf956 100644
--- a/osu.Game.Rulesets.Osu/Objects/Slider.cs
+++ b/osu.Game.Rulesets.Osu/Objects/Slider.cs
@@ -19,14 +19,14 @@ namespace osu.Game.Rulesets.Osu.Objects
 {
     public class Slider : OsuHitObject, IHasCurve
     {
-        public double EndTime
+        public double EndTime => StartTime + this.SpanCount() * Path.Distance / Velocity;
+
+        public double Duration
         {
-            get => StartTime + this.SpanCount() * Path.Distance / Velocity;
+            get => EndTime - StartTime;
             set => throw new System.NotSupportedException($"Adjust via {nameof(RepeatCount)} instead"); // can be implemented if/when needed.
         }
 
-        public double Duration => EndTime - StartTime;
-
         private readonly Cached<Vector2> endPositionCache = new Cached<Vector2>();
 
         public override Vector2 EndPosition => endPositionCache.IsValid ? endPositionCache.Value : endPositionCache.Value = Position + this.CurvePositionAt(1);
diff --git a/osu.Game.Rulesets.Taiko/Objects/Drawables/DrawableSwell.cs b/osu.Game.Rulesets.Taiko/Objects/Drawables/DrawableSwell.cs
index 32f7acadc8..7294587b10 100644
--- a/osu.Game.Rulesets.Taiko/Objects/Drawables/DrawableSwell.cs
+++ b/osu.Game.Rulesets.Taiko/Objects/Drawables/DrawableSwell.cs
@@ -237,7 +237,7 @@ namespace osu.Game.Rulesets.Taiko.Objects.Drawables
 
                 case ArmedState.Miss:
                 case ArmedState.Hit:
-                    using (BeginAbsoluteSequence(Time.Current, true))
+                    using (BeginDelayedSequence(HitObject.Duration, true))
                     {
                         this.FadeOut(transition_duration, Easing.Out);
                         bodyContainer.ScaleTo(1.4f, transition_duration);
diff --git a/osu.Game.Tests/Visual/Gameplay/TestSceneDrawableScrollingRuleset.cs b/osu.Game.Tests/Visual/Gameplay/TestSceneDrawableScrollingRuleset.cs
index b25b81c9af..08fd849fa6 100644
--- a/osu.Game.Tests/Visual/Gameplay/TestSceneDrawableScrollingRuleset.cs
+++ b/osu.Game.Tests/Visual/Gameplay/TestSceneDrawableScrollingRuleset.cs
@@ -281,7 +281,7 @@ namespace osu.Game.Tests.Visual.Gameplay
                 yield return new TestHitObject
                 {
                     StartTime = original.StartTime,
-                    EndTime = (original as IHasEndTime)?.EndTime ?? (original.StartTime + 100)
+                    Duration = (original as IHasEndTime)?.Duration ?? 100
                 };
             }
         }
@@ -292,9 +292,9 @@ namespace osu.Game.Tests.Visual.Gameplay
 
         private class TestHitObject : ConvertHitObject, IHasEndTime
         {
-            public double EndTime { get; set; }
+            public double EndTime => StartTime + Duration;
 
-            public double Duration => EndTime - StartTime;
+            public double Duration { get; set; }
         }
 
         private class DrawableTestHitObject : DrawableHitObject<TestHitObject>
diff --git a/osu.Game/Rulesets/Objects/Legacy/Catch/ConvertHitObjectParser.cs b/osu.Game/Rulesets/Objects/Legacy/Catch/ConvertHitObjectParser.cs
index 43e8d01297..c10c8dc30f 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Catch/ConvertHitObjectParser.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Catch/ConvertHitObjectParser.cs
@@ -56,7 +56,7 @@ namespace osu.Game.Rulesets.Objects.Legacy.Catch
             };
         }
 
-        protected override HitObject CreateSpinner(Vector2 position, bool newCombo, int comboOffset, double endTime)
+        protected override HitObject CreateSpinner(Vector2 position, bool newCombo, int comboOffset, double duration)
         {
             // Convert spinners don't create the new combo themselves, but force the next non-spinner hitobject to create a new combo
             // Their combo offset is still added to that next hitobject's combo index
@@ -65,11 +65,11 @@ namespace osu.Game.Rulesets.Objects.Legacy.Catch
 
             return new ConvertSpinner
             {
-                EndTime = endTime
+                Duration = duration
             };
         }
 
-        protected override HitObject CreateHold(Vector2 position, bool newCombo, int comboOffset, double endTime)
+        protected override HitObject CreateHold(Vector2 position, bool newCombo, int comboOffset, double duration)
         {
             return null;
         }
diff --git a/osu.Game/Rulesets/Objects/Legacy/Catch/ConvertSpinner.cs b/osu.Game/Rulesets/Objects/Legacy/Catch/ConvertSpinner.cs
index 9de311c9d7..4b0270064a 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Catch/ConvertSpinner.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Catch/ConvertSpinner.cs
@@ -10,9 +10,9 @@ namespace osu.Game.Rulesets.Objects.Legacy.Catch
     /// </summary>
     internal sealed class ConvertSpinner : ConvertHitObject, IHasEndTime, IHasXPosition, IHasCombo
     {
-        public double EndTime { get; set; }
+        public double EndTime => StartTime + Duration;
 
-        public double Duration => EndTime - StartTime;
+        public double Duration { get; set; }
 
         public float X => 256; // Required for CatchBeatmapConverter
 
diff --git a/osu.Game/Rulesets/Objects/Legacy/ConvertHitObjectParser.cs b/osu.Game/Rulesets/Objects/Legacy/ConvertHitObjectParser.cs
index 9a60a0a75c..d8d90fddfa 100644
--- a/osu.Game/Rulesets/Objects/Legacy/ConvertHitObjectParser.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/ConvertHitObjectParser.cs
@@ -189,9 +189,9 @@ namespace osu.Game.Rulesets.Objects.Legacy
             }
             else if (type.HasFlag(LegacyHitObjectType.Spinner))
             {
-                double endTime = Math.Max(startTime, Parsing.ParseDouble(split[5]) + Offset);
+                double duration = Math.Max(0, Parsing.ParseDouble(split[5]) + Offset - startTime);
 
-                result = CreateSpinner(new Vector2(512, 384) / 2, combo, comboOffset, endTime);
+                result = CreateSpinner(new Vector2(512, 384) / 2, combo, comboOffset, duration);
 
                 if (split.Length > 6)
                     readCustomSampleBanks(split[6], bankInfo);
@@ -209,7 +209,7 @@ namespace osu.Game.Rulesets.Objects.Legacy
                     readCustomSampleBanks(string.Join(":", ss.Skip(1)), bankInfo);
                 }
 
-                result = CreateHold(pos, combo, comboOffset, endTime + Offset);
+                result = CreateHold(pos, combo, comboOffset, endTime + Offset - startTime);
             }
 
             if (result == null)
@@ -321,9 +321,9 @@ namespace osu.Game.Rulesets.Objects.Legacy
         /// <param name="position">The position of the hit object.</param>
         /// <param name="newCombo">Whether the hit object creates a new combo.</param>
         /// <param name="comboOffset">When starting a new combo, the offset of the new combo relative to the current one.</param>
-        /// <param name="endTime">The spinner end time.</param>
+        /// <param name="duration">The spinner duration.</param>
         /// <returns>The hit object.</returns>
-        protected abstract HitObject CreateSpinner(Vector2 position, bool newCombo, int comboOffset, double endTime);
+        protected abstract HitObject CreateSpinner(Vector2 position, bool newCombo, int comboOffset, double duration);
 
         /// <summary>
         /// Creates a legacy Hold-type hit object.
@@ -331,8 +331,8 @@ namespace osu.Game.Rulesets.Objects.Legacy
         /// <param name="position">The position of the hit object.</param>
         /// <param name="newCombo">Whether the hit object creates a new combo.</param>
         /// <param name="comboOffset">When starting a new combo, the offset of the new combo relative to the current one.</param>
-        /// <param name="endTime">The hold end time.</param>
-        protected abstract HitObject CreateHold(Vector2 position, bool newCombo, int comboOffset, double endTime);
+        /// <param name="duration">The hold end time.</param>
+        protected abstract HitObject CreateHold(Vector2 position, bool newCombo, int comboOffset, double duration);
 
         private List<HitSampleInfo> convertSoundType(LegacyHitSoundType type, SampleBankInfo bankInfo)
         {
diff --git a/osu.Game/Rulesets/Objects/Legacy/ConvertSlider.cs b/osu.Game/Rulesets/Objects/Legacy/ConvertSlider.cs
index 924182b265..0a3c1b40fd 100644
--- a/osu.Game/Rulesets/Objects/Legacy/ConvertSlider.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/ConvertSlider.cs
@@ -26,13 +26,13 @@ namespace osu.Game.Rulesets.Objects.Legacy
         public List<IList<HitSampleInfo>> NodeSamples { get; set; }
         public int RepeatCount { get; set; }
 
-        public double EndTime
+        public double Duration
         {
-            get => StartTime + this.SpanCount() * Distance / Velocity;
+            get => this.SpanCount() * Distance / Velocity;
             set => throw new System.NotSupportedException($"Adjust via {nameof(RepeatCount)} instead"); // can be implemented if/when needed.
         }
 
-        public double Duration => EndTime - StartTime;
+        public double EndTime => StartTime + Duration;
 
         public double Velocity = 1;
 
diff --git a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHitObjectParser.cs b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHitObjectParser.cs
index f94c4aaa75..bc64518f40 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHitObjectParser.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHitObjectParser.cs
@@ -37,21 +37,21 @@ namespace osu.Game.Rulesets.Objects.Legacy.Mania
             };
         }
 
-        protected override HitObject CreateSpinner(Vector2 position, bool newCombo, int comboOffset, double endTime)
+        protected override HitObject CreateSpinner(Vector2 position, bool newCombo, int comboOffset, double duration)
         {
             return new ConvertSpinner
             {
                 X = position.X,
-                EndTime = endTime
+                Duration = duration
             };
         }
 
-        protected override HitObject CreateHold(Vector2 position, bool newCombo, int comboOffset, double endTime)
+        protected override HitObject CreateHold(Vector2 position, bool newCombo, int comboOffset, double duration)
         {
             return new ConvertHold
             {
                 X = position.X,
-                EndTime = endTime
+                Duration = duration
             };
         }
     }
diff --git a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHold.cs b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHold.cs
index 1d92d638dd..dcb66163e4 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHold.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHold.cs
@@ -9,8 +9,8 @@ namespace osu.Game.Rulesets.Objects.Legacy.Mania
     {
         public float X { get; set; }
 
-        public double EndTime { get; set; }
+        public double Duration { get; set; }
 
-        public double Duration => EndTime - StartTime;
+        public double EndTime => StartTime + Duration;
     }
 }
diff --git a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertSpinner.cs b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertSpinner.cs
index 7dc13e27cd..b731f7c8d8 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertSpinner.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Mania/ConvertSpinner.cs
@@ -10,9 +10,9 @@ namespace osu.Game.Rulesets.Objects.Legacy.Mania
     /// </summary>
     internal sealed class ConvertSpinner : ConvertHitObject, IHasEndTime, IHasXPosition
     {
-        public double EndTime { get; set; }
+        public double Duration { get; set; }
 
-        public double Duration => EndTime - StartTime;
+        public double EndTime => StartTime + Duration;
 
         public float X { get; set; }
     }
diff --git a/osu.Game/Rulesets/Objects/Legacy/Osu/ConvertHitObjectParser.cs b/osu.Game/Rulesets/Objects/Legacy/Osu/ConvertHitObjectParser.cs
index b95ec703b6..75ecab0b8f 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Osu/ConvertHitObjectParser.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Osu/ConvertHitObjectParser.cs
@@ -56,7 +56,7 @@ namespace osu.Game.Rulesets.Objects.Legacy.Osu
             };
         }
 
-        protected override HitObject CreateSpinner(Vector2 position, bool newCombo, int comboOffset, double endTime)
+        protected override HitObject CreateSpinner(Vector2 position, bool newCombo, int comboOffset, double duration)
         {
             // Convert spinners don't create the new combo themselves, but force the next non-spinner hitobject to create a new combo
             // Their combo offset is still added to that next hitobject's combo index
@@ -66,11 +66,11 @@ namespace osu.Game.Rulesets.Objects.Legacy.Osu
             return new ConvertSpinner
             {
                 Position = position,
-                EndTime = endTime
+                Duration = duration
             };
         }
 
-        protected override HitObject CreateHold(Vector2 position, bool newCombo, int comboOffset, double endTime)
+        protected override HitObject CreateHold(Vector2 position, bool newCombo, int comboOffset, double duration)
         {
             return null;
         }
diff --git a/osu.Game/Rulesets/Objects/Legacy/Osu/ConvertSpinner.cs b/osu.Game/Rulesets/Objects/Legacy/Osu/ConvertSpinner.cs
index 8b21aab411..a231237077 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Osu/ConvertSpinner.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Osu/ConvertSpinner.cs
@@ -11,9 +11,9 @@ namespace osu.Game.Rulesets.Objects.Legacy.Osu
     /// </summary>
     internal sealed class ConvertSpinner : ConvertHitObject, IHasEndTime, IHasPosition, IHasCombo
     {
-        public double EndTime { get; set; }
+        public double Duration { get; set; }
 
-        public double Duration => EndTime - StartTime;
+        public double EndTime => StartTime + Duration;
 
         public Vector2 Position { get; set; }
 
diff --git a/osu.Game/Rulesets/Objects/Legacy/Taiko/ConvertHitObjectParser.cs b/osu.Game/Rulesets/Objects/Legacy/Taiko/ConvertHitObjectParser.cs
index db65a61c90..13e3e84c6a 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Taiko/ConvertHitObjectParser.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Taiko/ConvertHitObjectParser.cs
@@ -33,15 +33,15 @@ namespace osu.Game.Rulesets.Objects.Legacy.Taiko
             };
         }
 
-        protected override HitObject CreateSpinner(Vector2 position, bool newCombo, int comboOffset, double endTime)
+        protected override HitObject CreateSpinner(Vector2 position, bool newCombo, int comboOffset, double duration)
         {
             return new ConvertSpinner
             {
-                EndTime = endTime
+                Duration = duration
             };
         }
 
-        protected override HitObject CreateHold(Vector2 position, bool newCombo, int comboOffset, double endTime)
+        protected override HitObject CreateHold(Vector2 position, bool newCombo, int comboOffset, double duration)
         {
             return null;
         }
diff --git a/osu.Game/Rulesets/Objects/Legacy/Taiko/ConvertSpinner.cs b/osu.Game/Rulesets/Objects/Legacy/Taiko/ConvertSpinner.cs
index 8e28487f2f..0976106ec4 100644
--- a/osu.Game/Rulesets/Objects/Legacy/Taiko/ConvertSpinner.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/Taiko/ConvertSpinner.cs
@@ -10,8 +10,8 @@ namespace osu.Game.Rulesets.Objects.Legacy.Taiko
     /// </summary>
     internal sealed class ConvertSpinner : ConvertHitObject, IHasEndTime
     {
-        public double EndTime { get; set; }
+        public double Duration { get; set; }
 
-        public double Duration => EndTime - StartTime;
+        public double EndTime => StartTime + Duration;
     }
 }
diff --git a/osu.Game/Rulesets/Objects/Types/IHasEndTime.cs b/osu.Game/Rulesets/Objects/Types/IHasEndTime.cs
index bc7103c60d..5eb551e15c 100644
--- a/osu.Game/Rulesets/Objects/Types/IHasEndTime.cs
+++ b/osu.Game/Rulesets/Objects/Types/IHasEndTime.cs
@@ -13,12 +13,12 @@ namespace osu.Game.Rulesets.Objects.Types
         /// <summary>
         /// The time at which the HitObject ends.
         /// </summary>
-        [JsonIgnore]
-        double EndTime { get; set; }
+        double EndTime { get; }
 
         /// <summary>
         /// The duration of the HitObject.
         /// </summary>
-        double Duration { get; }
+        [JsonIgnore]
+        double Duration { get; set; }
     }
 }
diff --git a/osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineHitObjectBlueprint.cs b/osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineHitObjectBlueprint.cs
index dd2f7a833e..d6fc17f358 100644
--- a/osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineHitObjectBlueprint.cs
+++ b/osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineHitObjectBlueprint.cs
@@ -296,7 +296,7 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
                             if (endTimeHitObject.EndTime == snappedTime)
                                 return;
 
-                            endTimeHitObject.EndTime = snappedTime;
+                            endTimeHitObject.Duration = snappedTime - hitObject.StartTime;
                             break;
                     }