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[swedguy]

1/2 a day? It all depends on where you start.

Sea level -> 2,000 meter in 1/2 a day and stay there for an extended period: no problem
6,000 meter -> 8,000 meter in 1/2 a day and stay there for an extended period: You would not be a happy camper

Most people can handle 2,500 since that's what's simulated when you fly an airplane. Above that, people with physical conditions can get problems.

General rule of thumb is that it takes 1-3 days to acclimatize to a new altitude/less oxygen (we can speak in climbing terms since it's the same effect), the times depends on your physical condition. When you climb, you should not climb more than 300 meters and sleep there. If you climb more than that (like when they go for the summit), they climb during the day and sleep at the altitude they are acclimatized to.
The time it takes for a climber to get acclimatized to camp 4 at 8000m (where they start the summit climb from) from base camp at 5400m, takes about 1 month.

So climbers have definitely proved that the body will not adapt to change of oxygen in less than 1/2 a day.

[juggernaut]

Originally Posted by swedguy

1/2 a day? It all depends on where you start.

Sea level -> 2,000 meter in 1/2 a day and stay there for an extended period: no problem
6,000 meter -> 8,000 meter in 1/2 a day and stay there for an extended period: You would not be a happy camper

Most people can handle 2,500 since that's what's simulated when you fly an airplane. Above that, people with physical conditions can get problems.

General rule of thumb is that it takes 1-3 days to acclimatize to a new altitude/less oxygen (we can speak in climbing terms since it's the same effect), the times depends on your physical condition. When you climb, you should not climb more than 300 meters and sleep there. If you climb more than that (like when they go for the summit), they climb during the day and sleep at the altitude they are acclimatized to.
The time it takes for a climber to get acclimatized to camp 4 at 8000m (where they start the summit climb from) from base camp at 5400m, takes about 1 month.

So climbers have definitely proved that the body will not adapt to change of oxygen in less than 1/2 a day.

Well I spent a whole month in the Utah Mountains during December. The elevation was 9572 feet = 2,917.5456 meters. I smoked the whole time and never had any issues with adapting to the less oxygen. Well I should not say that. I was tired at times but I think that was more from all the work. But we are not talking about the heights you are talking about, but then again no one lives there so maybe 1k or 2k meters would be a more realistic in the lines of adapting to the the less oyxgen as there are people living at those elevations. But not to many people are living on top of Everest.
Heres my pic of my squad siting 1/2 why up Mount Ogden in Utah. Squad If you look over the back of the truck you will see those are not hills. Me, I'm the guy in the back right with all the black head gear on as I hate the cold. And yes it was fucking cold. It was nice the 1st day. It Can you say nut to butt lol. We did not wait around for 1/2 day to get a move on. We rolled right out. Either you fell behind or you kept up, thats just how it was. I still dont think most people would have issues with not having 20% of their oxygen. But thats just me.