umm i'm not too sure for basketball and hockey, i think they have a set time tho........
in baseball, they play for 9 innings, with a total of 6 outs per inning......... in theory this can take any amount of time, but its usually 2-3 hours i think
tennis is the same deal...... for guys, they play until someone wins 3 sets.... which is usually around 18 games..... for girls, they play until somene wins 2 sets..... the time varies depending on the disparity b/t the players' skill levels........
@millardo- white sox won again!! it was a close game tho, unlike yesterday