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.
Delay of game
The foul known as "delay of game" in American football is called "time count" in Canada. It is generally identical to the American foul, with two important exceptions. First, Canadian football only allows the offensive team 20 seconds from the referee's signal to put the ball in play, as opposed to the longer periods allowed in the American code. Second, the penalty, which is identical to that in the American code during most of the game, including convert attempts at any time, is dramatically different after the Canadian code's three-minute warning near the end of each half. After the three-minute warning, the base penalty becomes loss of down on first or second down, instead of the regular 5 yards. On third down (the final down that the offensive side has to gain a first down), the penalty becomes 10 yards with the down repeated. The referee also has the right to give possession to the defensive team if he deems repeated time count violations on third down to be deliberate.