diff --git a/GeometryDashAPI.Tests/LevelLengthTests.cs b/GeometryDashAPI.Tests/LevelLengthTests.cs
new file mode 100644
index 0000000..ad0b5cb
--- /dev/null
+++ b/GeometryDashAPI.Tests/LevelLengthTests.cs
@@ -0,0 +1,24 @@
+using System.IO;
+using System.Net;
+using FluentAssertions;
+using GeometryDashAPI.Levels;
+using GeometryDashAPI.Server;
+using GeometryDashAPI.Server.Responses;
+using NUnit.Framework;
+
+namespace GeometryDashAPI.Tests;
+
+[TestFixture]
+public class LevelLengthTests
+{
+    [TestCase("12034598_Conclusion", 57)]
+    [TestCase("28755513_TheFinalLair", 154)]
+    [TestCase("116631_XmasParty", 87)]
+    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);
+    }
+}
diff --git a/GeometryDashAPI/Levels/GameObjects/Specific/SpeedBlock.cs b/GeometryDashAPI/Levels/GameObjects/Specific/SpeedBlock.cs
index 9fefb0a..b86ed87 100644
--- a/GeometryDashAPI/Levels/GameObjects/Specific/SpeedBlock.cs
+++ b/GeometryDashAPI/Levels/GameObjects/Specific/SpeedBlock.cs
@@ -1,9 +1,14 @@
-using GeometryDashAPI.Attributes;
+using System;
+using GeometryDashAPI.Attributes;
 using GeometryDashAPI.Levels.Enums;
-using GeometryDashAPI.Levels.GameObjects.Default;
 
 namespace GeometryDashAPI.Levels.GameObjects.Specific
 {
+    /// <summary>
+    /// Represents the id of the speed block.<br/><br/>
+    /// Not to be confused with <see cref="SpeedType"/>.<br/>
+    /// Because it is responsible for a specific speed, instead of a specific block id
+    /// </summary>
     public enum SpeedBlockId
     {
         Orange = 200,
@@ -14,20 +19,23 @@ public enum SpeedBlockId
     }
 
     [GameBlock(200, 201, 202, 203, 1334)]
-    public class SpeedBlock : Block
+    public class SpeedBlock : Portal
     {
         [GameProperty("24", (short)Layer.B2)] protected override short zLayer { get; set; } = (short)Layer.B2;
         [GameProperty("25", -6)] public override int ZOrder { get; set; } = -6;
 
-        [GameProperty("13", true, true)]
-        public bool Using { get; set; } = true;
-
         public SpeedBlockId BlockType
         {
             get => (SpeedBlockId)Id;
             set => Id = (int)value;
         }
 
+        public SpeedType SpeedType
+        {
+            get => FromBlockIdToSpeedType(BlockType);
+            set => BlockType = FromSpeedTypeToBlockId(value);
+        }
+
         public SpeedBlock() : base(201)
         {
         }
@@ -35,5 +43,35 @@ public SpeedBlock() : base(201)
         public SpeedBlock(SpeedBlockId type) : base((int)type)
         {
         }
+
+        public SpeedBlock(SpeedType type) : base((int)FromSpeedTypeToBlockId(type))
+        {
+        }
+
+        public static SpeedType FromBlockIdToSpeedType(SpeedBlockId id)
+        {
+            return id switch
+            {
+                SpeedBlockId.Orange => SpeedType.Half,
+                SpeedBlockId.Default => SpeedType.Default,
+                SpeedBlockId.Green => SpeedType.X2,
+                SpeedBlockId.Purple => SpeedType.X3,
+                SpeedBlockId.Red => SpeedType.X4,
+                _ => throw new ArgumentOutOfRangeException(nameof(id), id, null)
+            };
+        }
+
+        public static SpeedBlockId FromSpeedTypeToBlockId(SpeedType speedType)
+        {
+            return speedType switch
+            {
+                SpeedType.Half => SpeedBlockId.Orange,
+                SpeedType.Default => SpeedBlockId.Default,
+                SpeedType.X2 => SpeedBlockId.Green,
+                SpeedType.X3 => SpeedBlockId.Purple,
+                SpeedType.X4 => SpeedBlockId.Red,
+                _ => throw new ArgumentOutOfRangeException(nameof(speedType), speedType, null)
+            };
+        }
     }
 }
diff --git a/GeometryDashAPI/Levels/GameObjects/Triggers/DisableBGEffectTrigger.cs b/GeometryDashAPI/Levels/GameObjects/Triggers/DisableBgEffectTrigger.cs
similarity index 100%
rename from GeometryDashAPI/Levels/GameObjects/Triggers/DisableBGEffectTrigger.cs
rename to GeometryDashAPI/Levels/GameObjects/Triggers/DisableBgEffectTrigger.cs
diff --git a/GeometryDashAPI/Levels/GameObjects/Triggers/EnableBGEffectTrigger.cs b/GeometryDashAPI/Levels/GameObjects/Triggers/EnableBgEffectTrigger.cs
similarity index 100%
rename from GeometryDashAPI/Levels/GameObjects/Triggers/EnableBGEffectTrigger.cs
rename to GeometryDashAPI/Levels/GameObjects/Triggers/EnableBgEffectTrigger.cs
diff --git a/GeometryDashAPI/Levels/Level.cs b/GeometryDashAPI/Levels/Level.cs
index 64bca39..851692c 100644
--- a/GeometryDashAPI/Levels/Level.cs
+++ b/GeometryDashAPI/Levels/Level.cs
@@ -23,6 +23,8 @@ public Guidelines Guidelines
             set => Options.Guidelines = value;
         }
 
+        public TimeSpan LevelLength => Levels.LevelLength.Measure(this);
+
         public int CountBlock => Blocks.Count;
         public int CountColor => Options.Colors.Count;
 
diff --git a/GeometryDashAPI/Levels/LevelLength.cs b/GeometryDashAPI/Levels/LevelLength.cs
new file mode 100644
index 0000000..555af5d
--- /dev/null
+++ b/GeometryDashAPI/Levels/LevelLength.cs
@@ -0,0 +1,34 @@
+using System;
+using System.Linq;
+using GeometryDashAPI.Levels.GameObjects.Specific;
+
+namespace GeometryDashAPI.Levels
+{
+    public static class LevelLength
+    {
+        public static TimeSpan Measure(Level level)
+        {
+            var maxX = level.Blocks.Max(x => x.PositionX);
+            var portals = GetSpeedBlocks(level);
+
+            var seconds = 0d;
+            var i = 1;
+            for (; i < portals.Length; i++)
+                seconds += (portals[i].PositionX - portals[i - 1].PositionX) / portals[i - 1].SpeedType.GetSpeed();
+
+            var final = Math.Min(i, portals.Length - 1);
+            var total = seconds + (maxX - portals[final].PositionX) / portals[final].SpeedType.GetSpeed();
+
+            return TimeSpan.FromSeconds(total);
+        }
+
+        private static SpeedBlock[] GetSpeedBlocks(Level level)
+        {
+            return new[] { new SpeedBlock(level.Options.PlayerSpeed) }
+                .Concat(level.Blocks.OfType<SpeedBlock>()
+                    .Where(x => x.Checked)
+                    .OrderBy(x => x.PositionX)
+                ).ToArray();
+        }
+    }
+}
diff --git a/GeometryDashAPI/Levels/LevelSpeed.cs b/GeometryDashAPI/Levels/LevelSpeed.cs
new file mode 100644
index 0000000..e51213e
--- /dev/null
+++ b/GeometryDashAPI/Levels/LevelSpeed.cs
@@ -0,0 +1,25 @@
+using GeometryDashAPI.Levels.Enums;
+
+namespace GeometryDashAPI.Levels
+{
+    public static class LevelSpeed
+    {
+        public const double Half = 251.16;
+        public const double Default = 311.58;
+        public const double X2 = 387.42;
+        public const double X3 = 468;
+        public const double X4 = 576;
+
+        public static double GetSpeed(this SpeedType speedType)
+        {
+            return speedType switch
+            {
+                SpeedType.Half => Half,
+                SpeedType.Default => Default,
+                SpeedType.X2 => X2,
+                SpeedType.X3 => X3,
+                SpeedType.X4 => X4
+            };
+        }
+    }
+}
diff --git a/GeometryDashAPI/Levels/Portal.cs b/GeometryDashAPI/Levels/Portal.cs
new file mode 100644
index 0000000..24cfcb5
--- /dev/null
+++ b/GeometryDashAPI/Levels/Portal.cs
@@ -0,0 +1,18 @@
+using GeometryDashAPI.Attributes;
+using GeometryDashAPI.Levels.GameObjects.Default;
+
+namespace GeometryDashAPI.Levels
+{
+    public class Portal : Block
+    {
+        [GameProperty("13", true, true)] public bool Checked { get; set; }
+
+        public Portal()
+        {
+        }
+        
+        public Portal(int id) : base(id)
+        {
+        }
+    }
+}
\ No newline at end of file