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Altitude has been weird for me. I've been at 4000m recently and was totally fine - no problem at all - but for the few days leading up to it I'd been at 1500m+ the entire time.
By comparison, I was once at 3000m and had to sit down and I almost fell asleep, but I had been at 250m above sea level for the few days leading up to it.
I got a permit to hike Mt Whitney (highest mountain in the lower 48) in July which is 4421m and I am 100% going to spend a couple of days at the base of it before I start to acclimatise.
JB
Living at sea level means that I'll always have to aclimatise to some extent but over the years the amount of aclimitisation I need has dropped considerably. The first time I went to 4,000m I nearly passed out.