Question: How long will supplemental oxygen last after the masks drop in an emergency? — Submitted by reader John A., N.J. Answer: On typical airliners oxygen generators will last 10 to 14 minutes.
Answer: On typical airliners oxygen generators will last 10 to 14 minutes. That is more than enough time to descend to 10,000 feet or the lowest altitude above the terrain. Airplanes can descend very ...