diff --git a/TMG.Visum/TransitAssignment/HeadwayImpedanceParameters.cs b/TMG.Visum/TransitAssignment/HeadwayImpedanceParameters.cs
index e7f0ff0..27c20e2 100644
--- a/TMG.Visum/TransitAssignment/HeadwayImpedanceParameters.cs
+++ b/TMG.Visum/TransitAssignment/HeadwayImpedanceParameters.cs
@@ -426,7 +426,8 @@ internal override void UpdateSTSUSegmentSpeeds(VisumInstance instance)
                 NetObjectType = "LINK",
                 OnlyActive = true,
                 ResultAttributeName = $"ADDVAL1",
-                Formula = $"IF({autoTimes} < 9999, {autoTimes}, 60 * [LENGTH] / {parameter.DefaultEROWSpeed})"
+                // 3600 because VISUM uses seconds for time
+                Formula = $"IF({autoTimes} < 9999, {autoTimes}, 3600 * [LENGTH] / {parameter.DefaultEROWSpeed})"
             });
 
             // Apply to lines in the filter