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.
Harrow football
A standard Harrow football match consists of two periods (known as halves) of 40 minutes each. There is usually a 15-minute break between halves, known as half time. The end of the match is known as full-time.