American Football Rules IFAF Approved Ruling 3-2-1:I

I. A game is scheduled with a kickoff time 3 hours before darkness. (a) It kicks off on schedule.
(b) The kickoff is delayed by 5 or more minutes. RULING: (a) The playing time will be as determined by the competition (48 minutes by default). (b) The playing time will be limited to a maximum of 40 minutes. [Cited by 3-2-1-d, 3-2-1-e]