When I was a kid, maybe 10 or 12 years old (I'm 63) the way we were taught that you could count seconds without a clock was say "one thousand one, one thousand two...etc. (I've also heard saying "Mississippi one, Mississippi two) It worked, and had tried it many times with various clocks and never failed to work out. I read time was speeding up a while back so the other day I tried the old method and much to my surprise the seconds on my watch went faster. I tried it on other clocks...same results. By the time I count to ten seconds, 11 seconds have passed. Try it yourself.