Time of Effective Performance ("Useful Consciousness") Healthy, resting, fully oxygenated aeronaut

Altitude usefulness M FL EP time 5,500 18 20-30 min 6,700 22 10 min 7,600 25 3-5 min 8,500 28 2-3 min 9,100 30 1-2 min 10,700 35 30-60 sec 12,200 40 15-20 sec 13,100 43 9-12 sec

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