All-
Is there a way to show in a cell in a rolling countdown. For example I
would like the timer to start at 30 mins (30:00) and countdown to 0. I would
like to take a current cell that contains a =now() formula and replace it
with this, but the catch would be it needs to intigrate with the on-time
method so that between the on-time method running the procedure it would
count down from 30-0 min. Is there anything out there like this?

Thanks in advance!