Originally Posted by
lougord99
They do not spell that out specifically, but most agree that 15 minutes is the number.
YMMV, I've been told 30 many times.
edit: wiki agrees
Standby travel is not allowed on a capacity controlled award. The only exceptions are the same as for a discount fare ticket: If your flight will depart 30 minutes or more late or if you miss your flight by less than 2 hours.