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15. Oxygen Masks Are Only Good For A Short Time

Frequent travelers may have even remembered the entire speech about oxygen masks. It is quite rare for you to find yourself using a drop-down mask in flight, so you may have wondered how they actually work. The drop-down oxygen mask works for about 15 minutes. These 15 minutes' worth of oxygen may not seem like a lot, but it is enough if you take deep breaths. During the time you are inhaling the oxygen from the mask, the pilot is able to descend to an altitude where he is able to equalize the cabin pressure.