How Many periods are in hockey in an NHL game?

Periods in hockey in an NHL game is three, where each period is about 20 minutes long of playtime. For the three periods it became a 60 minute game on ice. It has three periods which is different from the other sports because it is a fast paced game and players need to have 15 to 18 minutes time to take rest and strategize for the next period. It is important for the players because it is refreshing for the players. 

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