> I learned to swim a few weeks before my 13th birthday. Very little improvement in the past 60 years, but I keep trying.
>
> I don't use metric units all the time, but it's not a problem. I can think and measure in either system. Many people in the US can do that. The medical profession, and almost all sciences use metric measures. It's handy for those of us with scooter collections. My Cushmans are SAE and my Vespas, my Hondas, and the Benelli are all metric. I have two sets of tools. Is there such a thing as a metric screw driver?
> Howard
>

For me, it would largely depend on the stroke used. Coming from Australia, where most of us are taught to swim from a really young age, my answer was in the upper range (had to convert a mile to kilometres, too). If I was swimming freestyle/front crawl, it would probably be somewhat less. Breastroke, on the other hand, I could go on for ages. One of the benefits of living in a warm climate, I guess?

Br"Of course, my arms would be about to fall off at the end"yn