Regulation time is sixty (60) minutes: three (3) twenty (20) minute periods.
Time may be extended in the case of a tie, where as one (1) five (5) minute overtime session is conducted, (during the regular season) and if necessary a shoot-out will take place to decide the winner.
During the playoffs, overtime runs in unlimited twenty (20) minute 'sudden death' periods until a winner is declared.
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In professional hockey there is 20 minutes a period in smaller leagues it varies.
There are three twenty-minute periods in Ice Hockey, adding up to 60 minutes of play.