Running out the clock
In American football, each quarter of a game is measured with a 15-minute game clock, or 12-minute clock in many high school football codes and the German Football League. A team in possession of the lead and the ball will attempt to use up as much of the game clock as possible in order to bring the game to an end more quickly, thus denying the opposition another chance on offense.
Continental Indoor Football League
Playing Time – Four 15-minute quarters with a running clock. Clock only stops for incomplete passes and out of bounds plays during the final minute of the second and fourth quarters. 25-second play clock.