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A typical workout for a series competitive swimmer might be between 8000-10000 yards in a 2 hour period, or 320-400 25-yard laps in 2 hours. A beginning obviously will be substantially less.
How many laps is 400 meters? A regulation Olympic-size pool is 50 meters long, so it takes four laps of swimming from one end of the pool to the other to complete 400 meters. The 400-meter freestyle swim for men and women is part of the summer Olympic games.