Which of these durations matches the oxygen supply time of passenger oxygen generators?

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Multiple Choice

Which of these durations matches the oxygen supply time of passenger oxygen generators?

Explanation:
Passenger oxygen generators are designed to deliver oxygen for a limited period after the masks deploy, long enough for the aircraft to descend to a breathable altitude and for passengers to evacuate if needed. The typical duration is about 12 to 15 minutes, so 13 minutes closely matches what these systems are built to provide. Shorter times like 2 minutes or 8 minutes would be insufficient for a safe descent and potential evacuation, while 20 minutes exceeds the standard duration these passenger systems are designed to sustain.

Passenger oxygen generators are designed to deliver oxygen for a limited period after the masks deploy, long enough for the aircraft to descend to a breathable altitude and for passengers to evacuate if needed. The typical duration is about 12 to 15 minutes, so 13 minutes closely matches what these systems are built to provide. Shorter times like 2 minutes or 8 minutes would be insufficient for a safe descent and potential evacuation, while 20 minutes exceeds the standard duration these passenger systems are designed to sustain.

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