Citation 10
There ain't no average. Nada. Zip. Zilch. It's a whimsical situation with everybody from crew planners to senior flt ops manglement lyin'. You can score a great roster by intelligent bidding and get a "manual insertion" which screws the whole thing. (Lovely term that...) Some months all ya git is 2 in a row off and some months ya can score 10. It's mandated no more than 14... but it's as rare as ... rocking horse droppings.
Folks like yourself on the outside lookin' in just can't fathom that this isn't Kansas anymore Toto... nothin' here works like it does wherever it is ya come frum.
I know this answer must be frustratin' as hell; I don't mean it ta be. This is the way it is here.