During the summer we were working 18-21 days a month. It has eased off a bit now but still about 18 days at work. Usual roster looks something like 6 on usually made up of 2 x 3 day tours 2 or 3 days off then back in for 5 days. Again made up of something like a 3 day tour and a 2 day tour. Another few days off possibly 3 then another 4 or 5 days on with perhaps the odd day trip thrown in. And so it repeats. You can bid for what you want but if your in the bottom 30% forget being able to get anything other than a blind line. AKA no choice.
Day off payment.......about £240 before tax....so about £120 in your pocket.
How many hours? I really don't know but flying hours mean bugger all. What I can say is you will spend many more hours away from home
Duty time from a normal line is about 280hrs a month