There are four 15-minute quarters in an NFL game. The players have 12 minutes of rest after each quarter. Depending on how things are going, coaches can discuss the players’ first-half performances with them and give them praise or criticism. Gameplans might be changed to try to exploit flaws in the opposition or address issues within the squad.
There is no stoppage time to add on since, unlike in football, the timer starts counting down after 15 minutes and doesn’t run constantly.
While there is just an hour of playtime in total, taking pauses and interruptions into consideration, the real game can last many hours from beginning to end.
Although it takes almost 3 hours to complete the game with a half-break, strategy-making, and the coach’s instructions.