rename LevelLength to Duration

Author: Folleach

GeometryDashAPI.Tests/LevelLengthTests.cs renamed to GeometryDashAPI.Tests/LevelDurationTests.cs

@@ -9,7 +9,7 @@
 namespace GeometryDashAPI.Tests;
 
 [TestFixture]
-public class LevelLengthTests
+public class LevelDurationTests
 {
     [TestCase("12034598_Conclusion", 57)]
     [TestCase("28755513_TheFinalLair", 154)]
@@ -19,6 +19,6 @@ public void Test(string fileName, int expectedSeconds)
         var responseBody = File.ReadAllText(Path.Combine("data", "levels", fileName));
         var response = new ServerResponse<LevelResponse>(HttpStatusCode.OK, responseBody);
         var level = new Level(response.GetResultOrDefault().Level.LevelString, compressed: true);
-        level.LevelLength.TotalSeconds.Should().BeApproximately(expectedSeconds, precision: 1);
+        level.Duration.TotalSeconds.Should().BeApproximately(expectedSeconds, precision: 1);
     }
 }

GeometryDashAPI/Levels/Level.cs

@@ -23,7 +23,7 @@ public Guidelines Guidelines
             set => Options.Guidelines = value;
         }
 
-        public TimeSpan LevelLength => Levels.LevelLength.Measure(this);
+        public TimeSpan Duration => LevelDuration.Measure(this);
 
         public int CountBlock => Blocks.Count;
         public int CountColor => Options.Colors.Count;

GeometryDashAPI/Levels/LevelLength.cs renamed to GeometryDashAPI/Levels/LevelDuration.cs

@@ -4,7 +4,7 @@
 
 namespace GeometryDashAPI.Levels
 {
-    public static class LevelLength
+    public static class LevelDuration
     {
         public static TimeSpan Measure(Level level)
         {