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Private Sub Worksheet_Change(ByVal Target As Range)
If Intersect(Target, [S:S]) Is Nothing Then Exit Sub
On Error Resume Next
If Len(Target) = 3 Then
Target = TimeValue(Left(Target, 1) & ":" & Right(Target, 2) & ":" & 0)
Else
Target = TimeValue(Left(Target, 2) & ":" & Right(Target, 2) & ":" & 0)
End If
End Sub