For those guys looking at F9 for the MCO base, our most junior lineholder was hired 18 months ago. You can only imagine the garbage flying that's associated with the really junior lines. Redeyes in the middle of a 4 day, non-commutable, inefficient, 12 days off, working every weekend.
So if you are lucky, after about 2-2.5 years you 'might' be able to hold a weekend off here and there. Then the countdown to your "quick" upgrade begins with 600+ FOs in front of you, while you watch sporadic vacancies come out that list a measly 6 upgrades for a different base, on top of our monthly involuntary vacation cancellation love letter.