How long does the oxygen supply typically last?

The typical duration for the oxygen supply in a commercial aircraft, especially for emergency oxygen systems, is approximately 12-15 minutes. This duration is designed to provide adequate time for passengers and crew to experience a safe descent to an altitude where breathable air is available, or to facilitate the emergency procedures necessary in case of cabin depressurization.

Oxygen systems are engineered to deliver sufficient supply duration, considering that emergencies requiring supplemental oxygen are often time-sensitive. This timing allows for critical actions to be taken while ensuring that individuals can maintain consciousness and functionality during periods of reduced oxygen availability.

Other durations, such as 5-10 minutes or longer durations like 20 or 30 minutes, would not align with the specific operational requirements and safety protocols established in aviation for these types of emergencies.