Hang time generally refers to how long something stays in the air:
--- In Basketball , the length of time a player stays in the air after jumping, either to make a Slam Dunk , lay-up or jump shot. Compare with Ballon in Ballet .
--- In American Football , the length of time a punted ball flies through the air
--- In some First-person Shooter s, the length of time a player flies through the air as the result of a grenade jump