You can't put formulas to hold on for anything. If you change the calculation mode to Manual the formulas calculate when you press F9 or save the workbook. But even that's not timed.
With VBA you can force things to happen at certain time. This line of code waits for 10 sec before executing the next line:
Code:
[COLOR=#242729][FONT=Consolas]Application.Wait (Now + TimeValue("0:00:10"))[/FONT][/COLOR]