[Inyo-Mono]

It apparently takes two weeks for red blood cells to make 12,000 - 13,000 work well for us. I had come from 600 foot above sea level, but was quite fit.

Decades ago I climbed 14,509 foot Mt. Whitney (at the time believed to be 14,496'), air was sparse and it was difficult to hike at 14,000 feet but it helped that I live at 4,200 feet.

[HonkyTonkMan]

Incredible that you hit 14K. I’m amazed at the Sherpas who hike Everest w/out oxygen. Truly a superhuman feat.