User blog comment:DMUA/Jack of All Trades: Jack goes pretty fast but still nowhere near DC or Marvel (I cry but not really cause I'm just fine keeping this as a feat)/@comment-25603146-20180512161051

...the fastest human reactions get is ~0.1 seconds... saying that because it "seemed" instant to a human audience it must be a centisecond isn't really a sound argument, as the premise: that instantaneous to humans = 1 centisecond = is flawed to begin with. Even if we were to say that the movement occupied one standard "frame", that would be 1/30th a second (0.033).

You can just write in that the guy crossed the distance in a centisecond if you would like to be like that about it, I guess, but... that sort of thing kinda feels off-putting to me.