Done it a load of times though and my times are all over the place
I did some really fast ones, but you have to be honest with yourself that you didn't try to anticipate it like a starter's pistol, otherwise it's not a true reaction time.
And to be honest you would rarely match those times in games unless you are camping. It's scientifically proven apparently, that you'll add nearly a tenth of a second if you
don't know which direction it's coming at you from, left or right, up or down. So twice as long effectively!
Good fun trying though.