Minimum days off is 8 and that is what you can expect on the 777. 380 will be more like 12 but you will do more hours (typically around 100 block hours for captains at the moment but the FO rosters are catching up quickly). The bidding system is not worthy of the name. If you get one thing you ask for (for example, "layover in Europe") you bid is 100% satisfied and the computer will stop looking for other stuff to keep you happy. As a previous poster said, it sometimes seems that satisfaction is not only unimportant but actively discouraged!