Using this Code it works great!!!
https://www.teachexcel.com/excel-tutorial/countdown-timer-in-excel_1557.html
However... Is there anyway to have the clock always running even when I am in the worksheet adding text or data to other cells? The clock pauses til I click "Enter" or exit out of the cells.
Public interval As Date
Sub timer()
' Check if the timer is finished and exit the macro if it is
If Range("I5").Value = 0 Then Exit Sub
On Error Resume Next
' Remove 1 second from the timer
Sheets("ScoreBoard").Range("I5").Value = Range("I5").Value - TimeValue("00:00:01")
' Set when the macro should run again - should be the same time value as the previous line.
interval = Now + TimeValue("00:00:01")
' Make this macro run again in 1 second
Application.OnTime interval, "timer"
End Sub