1. Usually on days off from work.
2. I'm not there for the whole 16 hours (12-14 hour legs is my self imposed cap), I still do other tasks around the house, play on the PS3, or sleep depending on the time of day (real pilots do get breaks).
3. Yep and partially because of that I rarely fly online longhauls, no need to worry about ATC's or SUP's.
4. PS3 is a mere 8 inches away from the keyboard (it shares the same monitor as the PC in fact)
My longest flight was ORD-DOH which was around 12 hours, after reaching sunrise over the Atlantic and turning off the center pumps I went to bed and didn't wake up until the plane was about 2 hours from TOD.