How can I add a countdown timer into PowerPoint's slide master?

[MbwaMkubwa]

I am trying to add a countdown timer that would display on top of my slide
show. Preferably, I would like it to show down to the second, hundredth of a
second would be wonderful, but I'll settle for just a second. Is there an
existing program that we can add into the slide master that would display a
countdown timer on top of all of our slides?

 

[tohlz]

You can check for clocks and timers here:
http://www.rdpslides.com/pptfaq/FAQ00081.htm
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