Between 8 and 16 days off per month depending on many factors. It really doesn't do any good to expalin it all now because with the arrival of the -300ERs it is going to change a lot, especially if we start doing more long haul.
The trips range from 1 day out and backs to an 11 day pairing that has 7 nights in Melbourne. Most of the European trips are 2/3 day trips with a 24 hour layover. The Asian trips tend to be 3 to 6 days with the Australian trips the longest at 8 and 11 days.
Personally, I fly a few hours of overtime every other month on average. The overtime threshold is based on the number of days in the month. In February it was 70, that would be the low side. In a 31 day month it is something like 76, paid at 400 Dirhams an hour.
TP