diff --git a/RotationSolver.Basic/DataCenter.cs b/RotationSolver.Basic/DataCenter.cs
index 023e56e10..2a5e80048 100644
--- a/RotationSolver.Basic/DataCenter.cs
+++ b/RotationSolver.Basic/DataCenter.cs
@@ -138,7 +138,9 @@ public static unsafe ushort FateId
     public static uint[] BluSlots { get; set; } = new uint[24];
 
     static DateTime _specialStateStartTime = DateTime.MinValue;
-    public static double SpecialTimeLeft => Service.Config.SpecialDuration + WeaponRemain - (DateTime.Now - _specialStateStartTime).TotalSeconds;
+    private static double SpecialTimeElapsed => (DateTime.Now - _specialStateStartTime).TotalSeconds;
+    public static double SpecialTimeLeft => WeaponTotal == 0 || WeaponElapsed == 0 ? Service.Config.SpecialDuration - SpecialTimeElapsed :
+        Math.Ceiling((Service.Config.SpecialDuration + WeaponElapsed - SpecialTimeElapsed) / WeaponTotal) * WeaponTotal - WeaponElapsed;
 
     static SpecialCommandType _specialType = SpecialCommandType.EndSpecial;
     public static SpecialCommandType SpecialType =>