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.
National Football League on television
The NFL regular season usually begins in September, and ends in December or early January. Each team plays 16 games during a 17-week period. Traditionally, the majority of each week's games are played on Sunday afternoon. The Sunday afternoon games are televised regionally, where the particular game available on local television will depend on where the viewer is located, and begin at either approximately 1 p.m. or 4 p.m. Eastern Time. In addition, there are usually single nationally televised games each on Thursday night, Sunday night, and Monday night. These primetime games are broadcast across the country over one national over-the-air broadcast or cable network, where there are no regional restrictions, nor any other competing NFL contest.