It depends. Usually about 5-15 minutes is what I know, but I am not entirely sure.
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twenty minutes for each period. There are three periods.
swimming , hockey racing,long jump,skating
Same as America. 20 minutes each period (3 periods). A total of 60 minutes of game.
It is unknown. Hockey has been claimed to be founded in so many different time periods, that it is impossible to know how old it is.
it was to keep the soldiers busy durning the long waiting periods between flighting.