Reserve: I would say average 6 months now, but with all the hiring these days that should push you up the list faster. Equipment/Domiciles will make a difference but not much.
Commuting on reserve: Well of course it could be difficult if they give you 0600 duty on. You could work it with sched the night before and could get a commutable late reserve show then on the last day of your reserve block get released by 1700 if nothings happnin'. Bottomline though commuting on reserve can suck.