I'm an ORD based FO, 2.5 years longevity. I bid around #30 of 80 FOs. I'm a commuter, but I have a really short commute so I can bid two-thirds of the trips in the base. My lines are 16-17 days off with 83ish hours of credit. I've held all weekends off for a year or so. This month I picked up a weekend because it had an overnight in my hometown.

Reserve, as the previous poster said, gets you 12 days off a month. Bid for long stretches if you commute and want to be given out of base reserve (the company puts you up in a hotel in a different base to sit reserve there instead of your actual base). Bid short stretches if you live in base and want to avoid it.