Generally in 25 meter pools the mile is taken as 64 lengths, which is somewhat less than a statute mile (1762 yards) . 65 lengths is somewhat longer . 72 lengths would be a lot longer. In my opinion if you are not living in the USA you should think in meters as far as swimming is concerned and regard the mile as something irrelevant.
In the old days, when converting meters to yards for athletics purposes, we took 100 meters as 109 yards one foot and one inch, which I believe is fairly accurate. The figure for one meter is 39.37 inches I believe. The 200 meters race is a little shorter than the 220 and the 400 meters and 800 meters a little shorter than the 440 and 880 yards.