diff --git a/osu.Game.Rulesets.Catch/Objects/BananaShower.cs b/osu.Game.Rulesets.Catch/Objects/BananaShower.cs
index 267e6d12c7..0c754412e5 100644
--- a/osu.Game.Rulesets.Catch/Objects/BananaShower.cs
+++ b/osu.Game.Rulesets.Catch/Objects/BananaShower.cs
@@ -36,7 +36,11 @@ namespace osu.Game.Rulesets.Catch.Objects
             }
         }
 
-        public double EndTime => StartTime + Duration;
+        public double EndTime
+        {
+            get => StartTime + Duration;
+            set => Duration = value - StartTime;
+        }
 
         public double Duration { get; set; }
     }
diff --git a/osu.Game.Rulesets.Catch/Objects/JuiceStream.cs b/osu.Game.Rulesets.Catch/Objects/JuiceStream.cs
index a4ed966abb..4d68bf592c 100644
--- a/osu.Game.Rulesets.Catch/Objects/JuiceStream.cs
+++ b/osu.Game.Rulesets.Catch/Objects/JuiceStream.cs
@@ -110,7 +110,11 @@ namespace osu.Game.Rulesets.Catch.Objects
             }
         }
 
-        public double EndTime => StartTime + this.SpanCount() * Path.Distance / Velocity;
+        public double EndTime
+        {
+            get => StartTime + this.SpanCount() * Path.Distance / Velocity;
+            set => throw new System.NotImplementedException();
+        }
 
         public float EndX => X + this.CurvePositionAt(1).X / CatchPlayfield.BASE_WIDTH;
 
diff --git a/osu.Game.Rulesets.Mania/Objects/HoldNote.cs b/osu.Game.Rulesets.Mania/Objects/HoldNote.cs
index bdba813eed..86d3d2b2b0 100644
--- a/osu.Game.Rulesets.Mania/Objects/HoldNote.cs
+++ b/osu.Game.Rulesets.Mania/Objects/HoldNote.cs
@@ -15,7 +15,11 @@ namespace osu.Game.Rulesets.Mania.Objects
     /// </summary>
     public class HoldNote : ManiaHitObject, IHasEndTime
     {
-        public double EndTime => StartTime + Duration;
+        public double EndTime
+        {
+            get => StartTime + Duration;
+            set => Duration = value - StartTime;
+        }
 
         private double duration;
 
diff --git a/osu.Game.Rulesets.Osu/Objects/Slider.cs b/osu.Game.Rulesets.Osu/Objects/Slider.cs
index fe65ab78d1..bab7e6dbee 100644
--- a/osu.Game.Rulesets.Osu/Objects/Slider.cs
+++ b/osu.Game.Rulesets.Osu/Objects/Slider.cs
@@ -18,7 +18,12 @@ namespace osu.Game.Rulesets.Osu.Objects
 {
     public class Slider : OsuHitObject, IHasCurve
     {
-        public double EndTime => StartTime + this.SpanCount() * Path.Distance / Velocity;
+        public double EndTime
+        {
+            get => StartTime + this.SpanCount() * Path.Distance / Velocity;
+            set => throw new System.NotImplementedException();
+        }
+
         public double Duration => EndTime - StartTime;
 
         private readonly Cached<Vector2> endPositionCache = new Cached<Vector2>();
@@ -81,7 +86,7 @@ namespace osu.Game.Rulesets.Osu.Objects
             set
             {
                 repeatCount = value;
-                endPositionCache.Invalidate();
+                updateNestedPositions();
             }
         }
 
diff --git a/osu.Game.Rulesets.Taiko/Objects/DrumRoll.cs b/osu.Game.Rulesets.Taiko/Objects/DrumRoll.cs
index 8956ca9c19..aacd78f176 100644
--- a/osu.Game.Rulesets.Taiko/Objects/DrumRoll.cs
+++ b/osu.Game.Rulesets.Taiko/Objects/DrumRoll.cs
@@ -18,7 +18,11 @@ namespace osu.Game.Rulesets.Taiko.Objects
         /// </summary>
         private const float base_distance = 100;
 
-        public double EndTime => StartTime + Duration;
+        public double EndTime
+        {
+            get => StartTime + Duration;
+            set => Duration = value - StartTime;
+        }
 
         public double Duration { get; set; }
 
diff --git a/osu.Game.Rulesets.Taiko/Objects/Swell.cs b/osu.Game.Rulesets.Taiko/Objects/Swell.cs
index e60984596d..2f06066a16 100644
--- a/osu.Game.Rulesets.Taiko/Objects/Swell.cs
+++ b/osu.Game.Rulesets.Taiko/Objects/Swell.cs
@@ -11,7 +11,11 @@ namespace osu.Game.Rulesets.Taiko.Objects
 {
     public class Swell : TaikoHitObject, IHasEndTime
     {
-        public double EndTime => StartTime + Duration;
+        public double EndTime
+        {
+            get => StartTime + Duration;
+            set => Duration = value - StartTime;
+        }
 
         public double Duration { get; set; }
 
diff --git a/osu.Game/Rulesets/Objects/Legacy/ConvertSlider.cs b/osu.Game/Rulesets/Objects/Legacy/ConvertSlider.cs
index 8d523022d6..b5cd9be245 100644
--- a/osu.Game/Rulesets/Objects/Legacy/ConvertSlider.cs
+++ b/osu.Game/Rulesets/Objects/Legacy/ConvertSlider.cs
@@ -26,7 +26,12 @@ namespace osu.Game.Rulesets.Objects.Legacy
         public List<IList<HitSampleInfo>> NodeSamples { get; set; }
         public int RepeatCount { get; set; }
 
-        public double EndTime => StartTime + this.SpanCount() * Distance / Velocity;
+        public double EndTime
+        {
+            get => StartTime + this.SpanCount() * Distance / Velocity;
+            set => throw new System.NotImplementedException();
+        }
+
         public double Duration => EndTime - StartTime;
 
         public double Velocity = 1;
diff --git a/osu.Game/Rulesets/Objects/Types/IHasEndTime.cs b/osu.Game/Rulesets/Objects/Types/IHasEndTime.cs
index 516f1002a4..bc7103c60d 100644
--- a/osu.Game/Rulesets/Objects/Types/IHasEndTime.cs
+++ b/osu.Game/Rulesets/Objects/Types/IHasEndTime.cs
@@ -1,6 +1,8 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using Newtonsoft.Json;
+
 namespace osu.Game.Rulesets.Objects.Types
 {
     /// <summary>
@@ -11,7 +13,8 @@ namespace osu.Game.Rulesets.Objects.Types
         /// <summary>
         /// The time at which the HitObject ends.
         /// </summary>
-        double EndTime { get; }
+        [JsonIgnore]
+        double EndTime { get; set; }
 
         /// <summary>
         /// The duration of the HitObject.
diff --git a/osu.Game/Rulesets/Objects/Types/IHasRepeats.cs b/osu.Game/Rulesets/Objects/Types/IHasRepeats.cs
index b22752e902..256b1f3963 100644
--- a/osu.Game/Rulesets/Objects/Types/IHasRepeats.cs
+++ b/osu.Game/Rulesets/Objects/Types/IHasRepeats.cs
@@ -14,7 +14,7 @@ namespace osu.Game.Rulesets.Objects.Types
         /// <summary>
         /// The amount of times the HitObject repeats.
         /// </summary>
-        int RepeatCount { get; }
+        int RepeatCount { get; set; }
 
         /// <summary>
         /// The samples to be played when each node of the <see cref="IHasRepeats"/> is hit.<br />