My AK 135 summer duty day was 14hrs on call, and 8hrs of that was allowed to be actual flying. That's a typical summer duty schedule. Winter obviously shorter because there's less daylight and lower demand for flights. 5 or 6 days a week depending on how the season goes, pilot staffing situation, number of passengers, and amounts of freight and mail. Impromptu charters come up fairly often too. When there's bad weather, you do lots of sitting around, checking weather, webcams (google FAA Alaska Webcams- neat), getting reports from outlying stations, explaining what's up to waiting passengers, and talking to other outfits to see what they are up to (or not) that day.
Some days involve no flying because of weather- boring. If you are lucky you'll be at an outfit that allows you to roam away from dispatch if you are punctual about returning when called. This is when you want to take naps or grab something to eat. Other outfits need you to stick around and help with loading and unloading planes. Caravans full of freight for example. And then there's the inevitable catch-up when the weather improves. Many summer days are so busy that you have to be careful not to exceed the eight hours and are lucky to eat a sandwich and empty your bladder in relative privacy.
At the end of the day you hopefully know what your schedule roughly looks like for tomorrow. A good dispatcher will look after their pilots. For example- if you have to show for the early scheduled flight you'll be done and on the way home before the pilots who were scheduled to show up for later flights. Does not always work out that way. You have to be flexible and not take it personally sometimes if you show at six am and aren't heading home until 8pm. Probably the biggest factor in seasonal pilots not being invited back is that they constantly bump heads with dispatchers on this.
Different outfits pay differently. Some have a flat daily rate, some (not many) only pay by flight hour, and some work a combination of the two. The combination is my preferred way. Last outfit- $140 per day plus $25 a flight hr based on hobbs time. Some outfits also have safety and or completion bonuses at the end of the season which can be pretty substantial. Basically if you bend anything though, even pretty minor, don't expect to get it if they've got one.
As far as hrs per year- depends on the season, company, aircraft, and your employment status. A good average for a new 207 pilot in Juneau would be around 450-500 hours for a summer flying job. Could be less, or quite a bit more. Last summer in the Beaver was not so good for me- lots of bad weather days, high fuel prices, and lower passenger loads than past years. Still good stuff though.
Cheers,