I could get our guys to find the average h-1 times that we have compiled. Problem is it would probably be misleading. This is because we record every time including the 5+s when a runner slows down.
I think the very fastest times we have recorded, excluding bunts, would be more useful for practice on defense.
Until we get that information... Very fast h-1 times would be 4 flat from the left side and 4.1-4.2 from the right side. I know we have seen some 3.9s from left and 4 flats from right.
Hate to state the obvious, but defense against the fast guy is different than defense against the slower guy or even the average guy.
A good drill for practice is to time from contact on various plays. If the ball is received at 1B at 4.2 or less on routine plays without extreme rush, that should be a minimum requirement. Otherwise there is no chance against the fastest guys. Then practice groundballs for fastest possible times. In otherwords against the guys who can really run fast. Footwork is usually the big difference maker for infielders.