Commercial airplane emergency oxygen masks only provide about 12 to 15 minutes of breathable air, which is mathematically just enough time for the pilot to descend to a safe altitude where you can breathe normally.

A closer look

Commercial airplane emergency oxygen masks only provide about 12 to 15 minutes of breathable air, which is mathematically just enough time for the pilot to descend to a safe altitude where you can breathe normally. It is a wonderfully brief window of survival that perfectly aligns with your sudden descent into absolute panic as you struggle to remember if you are supposed to help your screaming child before or after you secure your own elastic band. The airlines do not broadcast this terrifyingly short time limit during their upbeat safety videos, probably because telling passengers they only have a quarter of an hour of guaranteed brain function might ruin the relaxing vibe of the complimentary ginger ale service. Ignorance truly is bliss at thirty thousand feet