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Private Sub Worksheet_Change(ByVal Target As Range)
' Convert user entry of mm+ss as if had been entered
' as a time value of 0:mm:ss
With Target
If Mid(.Text, 3, 1) = "+" Then
.Value = TimeValue("0:" + Left(.Text, 2) + ":" + Right(.Text, 2))
.NumberFormat = "h:mm:ss"
End If
End With
End Sub