Typically, there is no limit to the number of overtime periods in American high school football unless there is a state association established time limit for the completion of games such as 12:30 a.m.
For the complete procedure established and governed by the National Federation of State High School Association (NFHS), check out their website, www.nfhs.org, 2012 Football Rules Book, page 89, "RESOLVING TIED GAMES".
Each state association may accept, amend or reject, in whole or part, any of the procedure.
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There is no set length. Each team alternates possessions following established College Football overtime rules until one team remains in the lead after a complete overtime period (both teams having had a possession).
The current NCAA Division I-FBS record for overtime periods is seven. The record for the shortest is one (two plays).
It is possible for overtime to last just one play; if the team that starts on defense intercepts the ball or recovers a fumble and returns it for a touchdown. That has not yet happened in NCAA competition since overtime was instituted in 1996.
The number varies by division.
In Division I-FBS (the top division), programs can schedule up to 12 games per season, unless one of those games is against Hawai'i. If the program schedules Hawai'i, the program is allowed 13 regular season games (this is to assist Hawai'i with travel considerations).
In Division I-FCS, programs can schedule 12 regular season games.
In Division II, programs can schedule 11 regular season games.
In Division III, programs can schedule 10 regular season games.
In each lower division, there are more playoff selections/rounds, so the number of actual games played can often be 14 or 15 for teams that reach the national championship game in the respective divisions.
There are an unlimited number of over time periods in college football since the modern-era rule change, making it virtually impossible for a college game to result in a tie score