After 25 years as a TV director, I can measure time in my head almost as accurately as a watch, usually within about 1 second per minute, and more accurately if I'm counting.
I used to have a little travel alarm clock, about 3 inches by 1 1/2 inches by 1/2 inch thick, that included a countdown timer and a synthesized voice. You could set the timer in hours, minutes and seconds, and the synth voice would count down "one minute remains", "30 seconds remain", etc., finally counting down from 10 seconds to zero.
Here's one similar to the one I had. Hey, it's 9 bucks. How can you go wrong?
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