Many pax complain of 'jet lag' after a long trip. The 'body clock' of an international pilot must either be exceptionally well conditioned over the years, or thoroughly 'stuffed', due to the zig zagging back and forth between time zones on a never ending cycle where you have to be 100% awake and compus. The few days off between flights would barely prepare your clock for the next onslaught. While we as passengers snuggle up for the night (well those in J and F), you have to meter your sleep pattern depending on crew numbers and flight duration. When I first saw the hours you 'worked", I too thought great job. Then I thought of the before mentioned issues, before flight preps, sitting in hotel rooms, different foods, training, sims, administration, sickness, vacations. Your duty hours are quite long.