If you have a question about how many periods in a hockey game. Then the simple answer is three periods of 20 minutes each. But, this 20 minutes time is not always the same. It changes due to various factors such as whistle stoppages and power plays. Whistle stoppages happen when any penalties, injuries, goals, and he puck going outside the playing area. Power play also are the major factors of increase in period time.
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