Countdown timers can be created fairly easy in PowerPoint. There are lots of needs for timers and I recently had a client call me from there event (that was already underway) asking for a countdown timer to run for the breaks.
Microsoft has some good resources available on its website. I simply emailed a link to the Microsoft Online where they have a few dozen ready-made countdown timers. My client found one they liked, added their logo to the master slide and was ready to go in less than 15 minutes.
To check out the countdown timer presentations Microsoft has available (for free), click here.
– Troy @ TLC