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.
Halftime show
A halftime show is a traditional element in an American football and Canadian football game. During the interval between the second and third quarters (normally 20 minutes) some form of entertainment is presented on the field. The entertainment frequently consists of performances by marching bands.