With a line cap of 77.5 for Oct as a line holder you are guaranteed 16 days off even as the most junior pilot, if you don't have any pre assigned activities. This is from the MD5. If you want to maximize your days off you will need to get trips that are worth more than 20 hours credit for a four day, the trade off will be to get those trips they at best will be commutable on the back end. Good luck.