is it possible to have a countdown timer in a cell,
can it be triggered when then sheet is opened and countdown from 15secs.

or is there a way to display the time from 'ontime' that you would use to
pause an application

right now I have got a sheet that shows for 15secs., then a different sheet
shows after that. Is there way to take that countdown time and show it or
does it count up

what the end result will be is a sheet that shows for 15 sec then goes away
,during the showing of that sheet I would like for a timer to countdown to 0
in a cell so that the user will know how many seconds is left for viewing