At a major league baseball game, you are sitting a distance 52 meters from home plate. how much time passes between seeing josh Hamilton hit a home run and actually hearing the crack of the bat?

sound travels through air at around 340 - 350 m/s.

to cover 52 meters takes it, say, (52/345) = about 0.15 second

This would be the same time-lag even if it were not a major-league game,

except that you might not be able to get a seat 52 meters from home plate

at a little league or t-ball game.