The only real long haul flight I've done that I can think of is London to Los Angeles direct. As I recall it was a little over eleven hours. I've flown further, but never in one hop, so far as I can recall.
I used to travel a fair amount as part of my job, but mostly I flew between London and NY / NJ, typically flying out on a Sunday to arrive in the US late afternoon or early evening. I developed a bit of reputation with my colleagues, too... Early on, I found I just could not work effectively while in flight. I really don't know why... Whether it was the noise, the proximity of other passengers in Business Class (not a problem with Eos, but that didn't last
), or the general sensation of flying, I just can't say... but I couldn't concentrate. So, I chose to relax instead... I'd watch a few movies, read, have two or three glasses of wine, sleep - all whilst my colleagues were working away on their laptops. I made it a rule that I would not work in-flight. At our destination, we'd shower and change, they would go out for dinner and hit the bars - but I would sit in a quiet corner of the hotel lounge bar with my computer, paperwork and a large Scotch... and I'd get three or four hours of solid, quality work done - then get to bed at a not-too-unsociable hour, and be ready to rock 'n' roll Monday morning sans hangover. Well, it worked for
me
My London to LA flight (and return) was a purely social thing, so I didn't have to worry about work. But my in-flight activities were pretty much the same