Time-wasting is illegal, subject to referee penalty, and countered by opposing team attempts to hurry up the restart of play. The goal of having a fair game with limited strategic rule-breaking requires a different set of rules, for example by stopping the game clock when the ball is out of play.
In Summary. A standard football match is 90 minutes made up of two 45-minute halves. In the middle of the game, there is a 15-minute break known as ‘half-time’. There are some exceptions to this duration including youth games and games with additional time and/or penalty shootouts.
Collegiate and professional football games are 60 minutes long, divided into four quarters of 15 minutes each. In high school football, 12 minute quarters are usually played. The clock is stopped frequently, however, with the result that a typical college or professional game can exceed three hours in duration.