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.
Super Bowl LI
Mohamed Sanu stated the long length of the halftime show played a part in Atlanta ultimately losing the game. Teams on average are off the field for fifteen minutes during halftime, but Super Bowl halftimes are considerably longer. Unlike the Falcons it appears Bill Belichick actually incorporated the length of the show into the team's practices. Sanu's argument was discounted by the fact that Atlanta marched the ball downfield and scored a touchdown right out of halftime.