It's the same as any other airline. If you commute, then you are generally gone more than someone who lives in base. Why? Because trips that allow you to commute in and out on the first and last day of the trip are not going to be worth as much (credit) as trips that start at 6:00am and end at 9:00pm. That means you have to work more trips in a month to get the same amount of credit as someone who works more productive trips with early starts and late finishes.

I bid about 55% in my base. For October I got all commutable trips, but only 13 days off, while people around my seniority who did not bid for commutability received 14-16 days off. It is what it is.