Swimming does burn calories at a rate of about 3 calories a mile per pound of bodyweight. If you weigh 150 lbs. and it takes you 30 minutes to swim one mile (1,760 yards or 1,609 meters), then you will be using about 900 calories in one hour. However, many swimmers do not swim that quickly, and many cannot swim for that distance or duration.
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5280 feet divided by 4 = 1320 feet = 1/4 mile. 1320 feet divided by 60 feet = 22 laps
33 laps would be 1/2 a mile in a standard 25 yard pool (up the pool being 1 lap, down the pool being your 2nd lap etc). So 30 laps would be shy of 1/2 mile and would equal 825 yards.