[Swordsman88]

12000ft would do in a pinch if you oxygen runs out but the rules say 10k so that is what you aim for. 8000fpm is not mucking around but i don't know if the 737 would be able to maintain that rate for long. Idle thrust and straight to the barber's pole gives you something like 6000fpm in a 767 over the course of the descent.....you can keep it to that easy enough with flight spoilers and the like. 737-4 is hardly the cleanest bird out there so you can't imaging it being too hard to get down in time. I thought it was 5minutes not 2 but i may be wrong. Oxygen supply to passengers lasts at least that long and the crew supply (including backup bottles) lasts twice that. Not sure for non-airline models....