This will get you going.

Now, just so you know, this doesn't recalculate for minutes more then 60,
and convert it to hours, then remaining minutes.

Just play with the numbers in your two input textboxes and you will see what
i mean.

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Private Sub txtRunMinutes_Change()
           Dim sHours As String
           sHours = (Me.txtMinutesWorked.Text - Me.txtRunMinutes.Text) / 60
           
           Dim sHours2 As String
           sHours2 = FormatNumber(Me.txtMinutesWorked.Text, 0)

           Dim sMinutes As String
           sMinutes = Me.txtMinutesWorked.Text
           
           Dim sMinutes2 As String
           sMinutes2 = FormatNumber(Me.txtRunMinutes.Text, 0)

           Dim sTotalMinutes As String
           sTotalMinutes = sHours2 - sMinutes2
           Me.txtDelayMinutes.Text = sTotalMinutes

           Dim sTotalHours As String
           sTotalHours = FormatNumber(sHours, 0) & "h "
           
           Dim sTotalMinutes2 As String
           sTotalMinutes2 = sTotalMinutes -
FormatNumber(Me.txtRunMinutes.Text, 0)

           Dim sLessMinutes As String
           sLessMinutes = sTotalHours & sTotalMinutes2 & "m"
           Me.txtDelayHours.Text = sLessMinutes

           Me.txtDelayInDecimal.Text = FormatNumber(sHours, 1)
End Sub

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There is always a better, more streamlined way of doing it, but i just blew
it out to give you a quick answer.

Hope this helps.