How much oxygen is in an airplane oxygen mask?

In any case, the mask is providing at least 122 mmHG of oxygen, as required by the Federal Aviation Administration (FAA). The masks supply supplemental oxygen for a short duration. According to FAA's CFR 91.211(b)(i), every occupant must have at least 10 minutes of oxygen on any flight above flight level 250.



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Masks will automatically drop
Any cabin depressurization above a certain altitude (usually around 14,000 feet) will cause the panels of the chambers containing the masks to automatically open, and the masks to drop down. This can, of course, be done manually by the cockpit crew as well.

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In the cabin, the flight crew will pull out their oxygen masks, which are connected to pressurized oxygen canisters. The chemical generators will last for 10-15 minutes, but apparently the flight crew's oxygen supply will last for a couple of hours.

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