20 thru 50 hours
To reach the summit of Mount Everest can take anywhere between 4 to 8 weeks. You have to allow time for your body to acclimatize to the high altitude by climbing high then descending low, then you must wait for the right weather window to allow you to climb to the summit and back safely.
extreme temps and thin air
You can learn more about Jon Krakauer's climb on Mount Everest by reading his excellent book 'Into Thin Air'
The higher you climb the less oxygen there is. At the summit of Mount Everest there is approximately 33% of the oxygen that is available at sea level.
You would have to be a very experienced climber to climb something like Mt. Everest. It is also a very dangerous thing to do--the risks could be avalanches or unable to breathe because the air is too thin.
Climbers use bottled oxygen on Mount Everest to help them breathe more easily because the higher you climb the less oxygen there is. At the summit of Mount Everest there is approximately 33% of the oxygen that is available at sea level.
Both Edmund Hillary and Tenzing Norgay reached the summit of Mount Everest using artifical oxygen from cylinders they carried on there backs.
Helecopters (like most aircraft) have an upper ceiling that restricts how high they can go. This is because a helecopter flies by pushing the air around it downward, and the air at very high altitudes (like Mt. Everest) is very thin (reducing the amound a helecopter can push downward). Because Mt. Everest is so high, no helecopter can climb as high as the top of it.
Jon Krakauer reached the summit of Mount Everest in 1996 during the well known storm that killed 15 climbers. He wrote a book about his climb called 'Into Thin Air'. It proved to be very popular but he got a lot of negative comments about it saying that some things he wrote were not true.
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Into Thin Air Death on Everest - 1997 TV is rated/received certificates of: Australia:PG UK:PG
It is harder to breathe on the summit of Mount Everest than at sea level due to the lack of oxygen. The higher you climb upwards the less oxygen there is, you enter the death zone where the thin air is.