Catch and release is .8 seconds of pop time (good footwork and mechanics), means that the ball needs to travel the 127 ft going 86.6 mph to get to 2b in one second, making pop time of 1.8 seconds
s = d/t
Pitcher to home of 1.4 added means you should throw out a runner that is timed 3.2 seconds from 1st to 2b or slower.
I'm not a mathematician, there are variables in this (HS, College, Pros - all differ), but you get the gist of it.
Also, if you can block 92 (I do not believe this is something you can quickly learn, regardless of what people say, it takes years of muscle and brain memory to just react combined with early pitch recognition burned into your brain through many years of practice and annual increase in ball speed), you still have to field the ball and then throw, lacking velo in that instance means the runner is safe