Sorry to be a pedant, but 3 Q400 sims worldwide - there is one in Seattle now too.
For FO's the hold pool is anything up to a year. It depends on where you live, as if you are well placed for one of the trickier bases, then you will be pulled out ahead of those who aren't. For skippers, the wait is considerably less, as they are short of experienced guys for the LHS - see last weeks flight for job ad for EDI captains.
Currently planning to put 10 new guys/gals (LHS and RHS) through per month, as one new Q400 planned to be delivered per month this year.