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I think Greg's answer is excellent, but I'd add the following. It's true that there's a delay before altitude sickness sets in - this is what makes going up to a 4000 meter peak on your second day ...
Answer
I think Greg's answer is excellent, but I'd add the following. It's true that there's a delay before altitude sickness sets in - this is what makes going up to a 4000 meter peak on your second day ...