1) Dunkers get a lot of it 2) Property of an infield fly 3) Slam dunk stat 
Hang time generally refers to how long something stays in the air: Hang time may also refer to: ...
The amount of time that a punted ball stays in the air. If a punted ball traveling 50 yards stays in the air for 3 or 4 seconds, that is excellent hang time.
[Football] the length of time a punt is in the air.
The amount of time that a punt stays in the air. Longer is better for the punting team as the tacklers then get more time to get to where the ball will be coming down. A combination of a long punt with a long hang time is optimal on most punts.
In the USA common name (hanging period) for the period between flowering and grape harvest. In a narrower sense, this also refers to the additional time during which the grapes are left hanging to reach full physiological ripeness.