rules to play canoeing

The minimum playing time is 6 minutes each way, and the maximum is 10. Play ends at the sound of the timekeepers horn whistle, not at the referees whistle (The only exception is if a goal penalty shot has been given before the timekeepers signal, but has not yet been taken. In this case play ends after the ball hits the water or rebounds back into play after the shot.). Half time lasts at least 1 minute, after which the teams change ends.