I spent over two hours on the top of the mountain in 1990,except for having a snooze in the car for half an hour and a bit out of breath climbing the steps to viewing platforms of some of the observatories felt no ill effects.
I then spent quite a few hours observing from the 9000ft mark where the visitors center was situated.
I have also climbed a mountain over 14000ft, Mt Kinabalu in Sabah Malaysia.
Except for the exsertion of the climb felt fine.
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