No idea how people do it even if in F or J. Perhaps when I was younger would have managed it, but now I'm in my 40s even a two week work trip over Atlantic in J feels tiring. I've flown approx 2500 TPs of flights (only had alcohol on one of those trips) since Sept and have to say that it has been more than enough to exhaust me. I'm a lightweight by FT standards. When I travel now, if my wife doesn't travel with me I get surprisingly lonely even if I am around people at the offices etc. It's not the same as being with family and friends and appreciate time at home now more than ever