The "metric mile" is 1500m, which is 60 lengths of a 25m pool or 30 lengths of a 50m Olympic pool. For training purposes it seems best to swim to the 1500m mark.
Most sports pools are built either in 25m or 50m lengths, though Maidstone Leisure Centre pool was built with a 33m length. After a few years Maidstone put in a barrier at the shallow end making the pool 25m and creating a narrow, shallow pool.
I have always been confused by the American concept of swimming laps, is a lap 2 lengths?
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