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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.
When you divide 1760 yards by 50 yards that equals 35.2 laps. Some like to round down and insist 35 laps = one mile, but there are others that like to round up and insist 36 laps = one mile. In a 500 yard swim race, a lap is equal to 25 yards. There are 20 laps in the race, or if a lap is considered to be 50 yards as shown above then there would be 10 laps in the race. 1760 yards in a mile divided by 500 yards = 3.52. If you take 3.52 and multiply it by 10 laps that also = 35.2.