I think best case is a matter of perception and mindset. If you are independent, don't mind traveling, can roll with change, like airplanes and adventure, then this job is never bad. If you like being at home, like set schedules and predictability and really enjoy the company of others.... this job can be hell. I say that because being an airline pilot is more of a lifestyle than a career and if you sign up, hoping to make this job as close to a normal job as possible (day trips, weekends and holidays off, etc) you're taking a pretty big gamble with your sanity.

But, that being said, the conventional answer is (IMHO):

Best case is the company is staffed just right and you have the option to bid high credit or bare minimum. PBS at SkyWest will allow you to bid down to 58.6 hours and still get benefits, so if you can get by on that money, that would equate to about 9-10 days of work per month (where I'm based, MX base, long trips but 3 days pay like 4 days). Conversely you could pick up lots of flying and put money away for whatever.