I've just tried to add up my sectors this year - 3 x ATL, 2 x CMB, 2 x CPH, 1 x CMB/SIN/MEL, 1 x AMS I reckon that's about 160 hours - all in the back or LoCo apart from 1 CMB/LHR C upgrade using miles.
The important thing is to relax, not get wound up by queues, delays or your fellow passengers. I sit there, snooze, and fairly attractive people bring you just about edible food and alcohol - never found this too stressful myself. Generally don't suffer from jet lag, catch up on my reading matter and enjoy the relative isolation.
