How many periods are played in a standard ice hockey game?

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ice hockey Goalie Marc-André Fleury of the Vegas Golden Knights blocking a shot by Jakub Vrána of the Washington Capitals in game five of the 2018 Stanley Cup finals. The Capitals won the game and the series.

A standard game of ice hockey is divided into three periods, each consisting of 20 minutes of playing time. Between these periods, there is a 15-minute intermission.1

While these three periods constitute the regulation game, rules regarding overtime vary by league and level of play to determine a winner in the event of a tie.1