For added confusion in Halifax (Canada Games Centre) at times with various pool activities at the same time -- the lanes are placed sideways; no floor markings for easy guidance and narrower than the standard lane. Collisions are common. So at these times the lane length isn't 25M but what ever the pool's 8 standard lanes measure sideways. Not a happy place when the management does this !! It kind of throws times and stroke counts per length out the window ! People complain and they still do it. It may take 110 "widrhs" to cover a mile if a lane is 6ft wide - normally. Maybe I'll take a tape measure and find out !
If you're not swimming; then you should be skiing......