Oxygen Masks Are Only Good For A Short Time
Regular flyers know that if there’s a change in cabin air pressure, they should put on their oxygen mask before assisting others. So just how long may that life-giving oxygen last?
When the cabin pressure drops too low, the mask automatically drops. A passenger oxygen mask will typically have enough air for 12 to 20 minutes. There usually is sufficient time for the pilot to raise the plane to a safe height; however, when masks are no longer necessary.
