How many periods are played in a standard hockey game?

A standard hockey game consists of three periods, each lasting 20 minutes in professional leagues such as the NHL. This structure is designed to provide an appropriate balance of gameplay and rest for athletes while maintaining competitive integrity. The three-period format allows for strategic play adjustments between each period, as teams can regroup, reassess performance, and make tactical decisions based on the current state of the game.

In contrast, an alternative structure with two, four, or five periods is not typical in ice hockey, as these would significantly alter the flow and pacing of the game, affecting strategies and athlete performance. The three-period format is a hallmark of ice hockey and contributes to its unique pace and excitement, which is why it is recognized officially in rules and regulations across various leagues.