I have this timer code I got courtesy of Chip Pearson
(http://www.cpearson.com/excel/TimedClose.htm) and am wondering if it can be
altered in such a way that when I get down to 3 minutes (NUM_MINUTES is set
to 10 minutes) ClosingSplashScreen.Show will run?

Private Sub Workbook_Open()

On Error Resume Next
Application.OnTime RunWhen, "SaveAndClose", , False
On Error GoTo 0
RunWhen = Now + TimeSerial(0, NUM_MINUTES, 0)
Application.OnTime RunWhen, "SaveAndClose", , True

End Sub