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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.
These values confirm that swimming is one of the best all around exercises available, due to the large number of muscle groups heavily involved. Running: Running at 8:00 per mile will generally use 11-20 kcals per minute, while a speed of 6:00 per mile (fast!) will use 14-25 kcals per minute.