I can only speak for the 767 (CVG base, at that), but typical days on for a month is 17. I've seen the occasional line that has 16, or even 15 days on, but you should count on having 17 work days.

We have a number of "hybrid" lines that include 3-4 days of reserve (often "at home" reserve days). So there's a chance that even with the 17 work days, you will get some of those at home. Also, many lines will have the 17 days broken up into two or more trip pairings.

In the 13 months I've been on line, I have only been extended beyond 17 days in a month twice, and one of those times was a situation beyond the company's control (and was only 1 additional day). The second time was just this past week (and was for 2 days). I don't know if that's typical on the 747 side of the house, but in my personal experience the company is pretty good about not exceeding the 17 days worked.

Monthly pay credit is guaranteed at 62 hours. The 767 lines almost never pay out based on block hours, they always pay on rig. Typical rigs range from the high-60's to the mid-70's for the month. Unless you get a reserve line where they leave you at home for 3-4 days, you will usually see more than the min guarantee. It's extremely rare for any of the lines in CVG to top 80 hours of pay for the month.

Starting in August or so, the 767 will likely become the new hire equipment as the seat locks begin to go away for guys that have been hired into the 767. While not everyone will jump ship to the 747, it's expected that many, if not most, will. Current 767 bases are JFK and CVG, with CVG being the larger of the two.

Just a quick note about insurance (as I'm no expert). There are several options available. I believe the cost (while not insignificant) is pretty reasonable. I've personally been satisfied with our insurance.