Originally Posted by QRH Bingo

No good "clean" answer. I like to describe it as feast/famine. You could be called on a Monday, fly every day, total 30hrs, and be home Friday night. Or you could sit at home for 2 weeks straight. Or be called on a Tuesday, sit in a hotel Wednesday, fly Thursday, and get an airline ticket home Friday. Typical busy time is Fall/Winter, with the slow time Spring/Summer.
You could potentially fly 8hrs in one day within 10hrs duty or fly 4hrs within 16hrs duty. There are too many variables to list, so you have to expect both extremes. Annual flight times are probably ~600 +/- 100 with the extremes being 800+ hrs.