Textbox/SpinButton - Time Greater Than 24hrs

I'm developing a local timesheet userform application and want to capture times which may be greater than 24hrs using a textbox/spinbutton pairing.

I've managed to pair up and work with times up to 24hrs but the output always resets after 23:55.

I've also tried formatting the output as "[h]:mm" but without success.


Private Sub sbDTime_SpinUp()

With ctrl2
If .Text = vbNullString Then
.Text = Format(TimeSerial(0, 5, 0), "hh:mm")
Else
.Text = Format(TimeValue(.Text) + 5, "hh:mm")
End If
End With
End Sub

Private Sub sbDTime_SpinDown()
With ctrl2
If .Text = vbNullString Then
.Text = Format(TimeSerial(0, 5, 0), "hh:mm")
Else
.Text = Format(TimeValue(.Text) + 5, "hh:mm")
End If
End With
End Sub