Dominican
I dont believe there are any awarded vacation days on the 20/10 rotation.
schedules on the 777 are only issued at 5 days at a time and you seem to be on hot standby when you get back from a rotation - its all a little murky and undefined right now and Im even having some trouble getting some clear answers - the management is however committed to improving things.
You can be sure though that you will be guaranteed your 10days off a month.
cheers