I'd say that's impressive but it depends on how long the pool is really
I plan to start swimming again soon, once I've settled back into my Uni schedule, and I now have a day off during the week when I will be able to go. The nearest pool is probably about 1 1/2 - 2 miles away so just walking there and back (walking back uphill too) would be good exercise. I'm not sure how long the pool is, maybe 20-25 metres or something like that.
I enjoy swimming but have to wear earplugs as I tend to get ear infections, not nice.