For approximately how long will the onboard oxygen flow for passengers and crew?

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Multiple Choice

For approximately how long will the onboard oxygen flow for passengers and crew?

Explanation:
When cabin pressure drops, oxygen masks automatically deploy and open a steady flow of oxygen to every passenger and crew member. The system is sized to provide oxygen for roughly 12 minutes, giving people enough time to descend to a breathable altitude and regain adequate oxygen levels. If the duration were as short as 8 minutes, it could run out before the aircraft could descend to safety. A longer duration, like 18 or 24 minutes, isn’t necessary for a standard emergency and would require a larger, heavier oxygen system. So the practical, commonly used duration is about 12 minutes.

When cabin pressure drops, oxygen masks automatically deploy and open a steady flow of oxygen to every passenger and crew member. The system is sized to provide oxygen for roughly 12 minutes, giving people enough time to descend to a breathable altitude and regain adequate oxygen levels.

If the duration were as short as 8 minutes, it could run out before the aircraft could descend to safety. A longer duration, like 18 or 24 minutes, isn’t necessary for a standard emergency and would require a larger, heavier oxygen system. So the practical, commonly used duration is about 12 minutes.

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