I guess it depends how far you're flying and how much quicker they could make it. 2 hours is my limit before the discomfort starts to get irritating. Usually by

I guess it depends how far you're flying and how much quicker they could make it. 2 hours is my limit before the discomfort starts to get irritating. Usually by the last 2-3 hours of an 8 hour flight I'm counting down the seconds until I can get off.