My understanding is there will be, more or less, indefinite hiring for the next +/- 9yrs provided all the aircraft on order come to fruition.

So ~100 jets = lots of interviewing/ hiring. If there is a break in hiring, it should pick up again shortly. I know a new hire class started last week and there's at least another one starting on Mar. 12th. Beyond that, I'm not sure....but again, go back to the first sentence and make your own assumptions.