<P> Teams change ends of the field at the end of the first quarter and the end of the third quarter, though otherwise the situation on the field regarding possession, downs remaining and distance - to - goal does not change at these occasions (so a team with possession 5 yards from the opponent's endzone at the end of the first quarter would resume play 5 yards from the endzone at the other end of the field, which they would then be attacking). Separating the first and second halves is halftime . Both halves, and any overtime, begin with kick - offs--the kicking team is decided by a coin toss (see below). </P> <P> In the NFL, an automatic timeout is called by the officials when there are two minutes left in both the second and the fourth quarters, and overtime; this is most commonly referred to as the two - minute warning . No such warning is normally given in amateur football, though if there is no visible stadium clock, the referee will give a two - minute warning (four minutes in high school). </P> <P> If a game is tied at the end of four quarters, overtime is played . In overtime, the coin is tossed to determine which team will possess the ball first . The winner of the coin toss can choose to give the ball or receive the ball . If the first possession results in a field goal, the other team is given possession to match or better the field goal; therefore continuing the game . If the first possession results in a touchdown or safety, the scoring team wins . During the regular season in the NFL, one overtime period is played (with each team receiving two time outs). If both teams are tied after the 10 - minute overtime, the game officially ends in a tie . In the playoffs, 15 - minute overtime periods continue until a winner is determined . Overtime follows after a three - minute intermission following the end of the regulation game . Prior to start of overtime, a coin flip is performed where the captain of the visiting team calls the toss . The team that wins the coin flip has the option to either receive the kickoff or choose the side of the field they wish to defend . Ties are rare in the NFL; a game between the Minnesota Vikings and Green Bay Packers on September 16, 2018 ended in a 29--all draw . The previous occurrence was one week earlier, on September 9, 2018 . </P> <P> Super Bowl LI was the first Super Bowl to go into overtime with a 28 - all tie between the Atlanta Falcons and New England Patriots, which the Patriots eventually won by scoring a touchdown on their first drive . </P>

How many ots are there in the nfl
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