Preseason football games in the NFL are typically played in four quarters, each lasting 15 minutes, just like regular season games. However, the actual duration of a preseason game is about the same as a regular season game, generally lasting around 3 hours. This is because of the stoppages for timeouts, reviews, commercials, and halftime. Preseason games don't have overtime anymore; since 2021, if a preseason game ends in a tie at the end of regulation time, it simply ends as a draw with no extra period played. So, in summary, preseason football games are about 3 hours long in real time, with four 15-minute quarters, and no overtime in case of a tie.