<Tr> <Td> </Td> <Td> This article may require cleanup to meet Wikipedia's quality standards . The specific problem is: No organization Please help improve this article if you can . (July 2016) (Learn how and when to remove this template message) </Td> </Tr> <P> A play clock, also called a delay - of - game timer, is a countdown clock intended to speed up the pace of the game, and hopefully the scoring, in American football and Canadian football . The offensive team must put the ball in play by either snapping the ball during a scrimmage down or kicking the ball during a free kick down before the time expires, or else they will be assessed a 5 - yard delay of game (American football) or time count (Canadian football; that code's "delay of game" is a different infraction) penalty . If a visible clock is not available or not functioning, game officials on the field will use a stopwatch or other similar device to enforce the rule . </P> <P> In all levels of Canadian football, the offensive team must run a play within 20 seconds of the referee whistling the play in; in amateur American football, teams have 25 seconds from the time the ball is declared ready for play . In the NFL, teams have 40 seconds timed from the end of the previous down . Before 2008, in college football, the play clock was 25 seconds after the ball was set, but the clock was not stopped for the ball to be set unless the previous play resulted in a stoppage of the clock . Now, the same intervals as the NFL are used, with minor differences for the final two minutes of each half . Various professional leagues have used their own standards; the XFL, for instance, used a 35 - second play clock to encourage faster play . </P> <P> Also in the Canadian Football League, a time count is enforced differently at certain points of the game . If the time count occurs before the three - minute mark of a half, the penalty is five yards and the down is repeated . In the final three minutes, the penalty is a loss of down on first and second down or 10 yards, with the down repeated, on third down . If the referee deems a time count committed on third down in the last three minutes of a half to be deliberate, he also has the right to require the offensive team to put the ball in play legally within 20 seconds or else forfeit possession . (Time counts during convert attempts, during which the ball is live but the clock does not run, are 5 - yard penalties with the down repeated at all times in the game .) </P>

When does the playclock start in the nfl