What do you mean, supposed to take? With some LCC seat pitches these days, you have to assume the position just to fit in the seat - you can see the impression of a nose on the seatback in front of you from the person who sat before. Two hours later, you can't feel your feckin' legs, and you're supposed to get out, inflate your life vest, etc? It'd probably be a small mercy if you were landed at an airport and they blew the slides - you wouldn't feel your legs break as you came off the slide even if you made it out of the aircraft in the first place.
<RANT MODE OFF>