Well, presuming that you equate a "lap" with "one length of the pool", a mile is 1760 yards, which means that you would have to swim 70.4 laps to swim a mile.
Thus, a one-half mile is equal to 35.2 laps or, more practically speaking, 35 laps plus 5 more yards.
However, in competitive swimming, the 1650 Yard Freestyle and 1500 Meter Freestyle races are colloquially referred to as "the mile."
The 1650 Yard Freestyle is only swum in swim meets that take place in non-metric, 25 yard pools. (There is no 1500 Freestyle in meets taking place in these yard-denominated pools.) The 1650 Yard Freestyle is 66 laps. One half of that race is 825 yards, which is 33 laps.
The 1500 Meter Freestyle is only swum in meets that take place in pools denominated in meters (pools of either 25 meters or 50 meters in length). (There is no 1650 Freestyle in meets taking place in these meters-denominated pools.) In at 25-meter pool, the 1500 Meter Freestyle is 60 laps, and one-half of it (750 meters) is 30 laps. In a 50 meter pool (i.e. an Olympic-sized pool), the 1500 Meter Freestyle is 30 laps, and one-half of it is 15 laps.
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