I suppose 60th;s of a second. will work.
I can start and stop my stop watch in 19 (60th;s of a second)

Any way if you would like to know what brought this up, I was on you tube and saw this
Game Theory: How Fast is Sonic the Hedgehog?
https://www.youtube.com/watch?v=ze_uxxFJTvE
And will they basically said sonic never brakes the sound barrier in the games.
They roughly measure how long the first act of Green hill zone is and said that the world record
Speed run of the first act was 0 minutes and 25 seconds. And that was not fast enough to brake the sound barrier. Not even close. And if Sonic broke the sound barrier the first game would be over in under a minute. Now that made sense but it was a little sad to here. But then I thought if the game was that fast, it would be to fast to play. What if the time on the screen was in slow motion, and what looked like minutes and seconds on the game timer ware actually seconds and 60th’s of a seconds in the world of the game. That may actually brake the sound barrier, or at least come closer to it.
Still do not like 60th of a second, maybe for the purpose of this I can call it, A (Sonic second)?