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comment by kleinbl00
kleinbl00  ·  2140 days ago  ·  link  ·    ·  parent  ·  post: Hiking the Pecos Wilderness, NM

As someone who spent a lot of time with friends acclimating (or not) to the altitude, the rule of thumb we professed was seven days.

We had the only olympic-sized swimming pool at 7000 feet or higher so we had athletes show up from around the world. None of them stayed for less than two weeks.

When I came down to sea level for the first time, it took ten days to acclimate the other way. I had been running 8 miles a day at 7200 feet so my first week in Bellingham involved like 12-mile runs. It was nuts.