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2

I can second Ron's answer (you don't) and add a personal anecdote; back in the mid 80s I was invited to join some skydivers taking a High Altitude Indoctrination Course at the Defense and Civil Institute of Environmental Medicine in Toronto when they had an open spot. A jumper had to have taken the course to be able to jump from altitudes above 12000 feet ...


2

The simple answer is "they don't". Training will dictate that at altitude, they need to be able to don masks within a few seconds, regardless of an individuals tolerance to altitude. The problem isn't that you have X seconds of full-cognition and then you pass-out, your brain function degrades during that period. It's best to get your mask on and oxygen ...


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