Photography question?

How long should you wait for Engagment pictures? Me and my FH took them in November and our photographer said it would take a month and a half to get them, since he had a couple other couples to work with.
I called him a couple weeks ago and he hasn't called me back. I'm getting a little impatient. We want to use the pictures for our invitaions.
How long did you guys have to wait?