How many minutes are in a hockey period

A hockey period is 20 minutes long. There are three periods in a regulation hockey game, so the total game time is 60 minutes.

How many periods are in a hockey game? Three periods
How long is each period in hockey? 20 minutes
How long is a regulation hockey game? 60 minutes
What happens if a hockey game is tied after regulation time? The game goes into overtime, which is a 5-minute sudden-death period.
What happens if a hockey game is still tied after overtime? The game goes into a shootout, where each team takes turns trying to score a goal.

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How many minutes are in a hockey period?