Another Chakira:
The smallest measurable unit of time is reputed to be the amount of time between when a traffic light in NYC turns green and the car behind you honks.
I always thought it was the amount of time between when the chazan finishes chazaras hashatz and some fool shouts yisgadal on a non-Tachanun day.
Are these actually one and the same, or is one in fact shorter than the other? Does there exist equipment sophisticated enough to measure?