Boston E190 has probably the shortest reserve. I was on reserve for 5 months, and in general you want long stretches of reserve due to how the system works. As a junior line holder most of my lines are 17-18 days off, with 75-80 hours of credit, working weekends. For November I had 18 days off, 83 hrs credit, and Thanksgiving off, but I had to fly non commutable trips to get that so I'm burning days off to get to work.