Home to first times can vary dramatically based on how the timer set it up. Letting a lefty slapper start in the LH batters box and get a running start will dramatically improve their times. We used to just line girls up at home plate and say "on your mark, get set, GO!" and time them until their foot hit the bag. Anything sub 3.0 seconds was pretty fast and 2.8 seconds was D1 speed.