Blocks vs. off the wall start

Does anyone have an estimate of how much time one could take off of a 50 free or *** by driving from the blocks, as opposed to a start off the wall as in practice.
  • Are you assuming the swimmer uses a: a. racing start or go start or b. a push, roll or self start, which eliminates reaction time and allows a slightly further dive the difference should be between 1 and 2 seconds diving from a block provides more distance through the air and speed upon entering the water Fastest: Roll start off blocks Slowest: Push start from a go Does anyone have an estimate of how much time one could take off of a 50 free or *** by driving from the blocks, as opposed to a start off the wall as in practice.