They go in increments of 50m. If you asked the width people go to, it would be 25m.
So your comment about avoiding the metric system is not really accurate. We don't say the Earth is approximately equal to 150 million kilometres from the Sun, we say one AU. We just use numbers that can be comprehended.
OK then about eight light minutes. Not sure there is any 31 mile long olympic swimming pool, though, but there are plenty of units out there so I can admit the possibility.
