It depends on the school and when your application is submitted and verified. Temple will send an invite about 1-2 week after you have submitted your app. Most of the other schools send an invite about 1-2 week after your app has been verified. Some schools like Scholl will wait until your app has been verified and your LORs have been received.
I had my MCAT, Transcript, App, LORs, etc. all set by August. I sent in my LORs to the schools early and had everything in approximately a week after apps opened up. Interviewed approximately 3 weeks after and received my acceptances approximately 2 weeks after interviewing.
So it took me about 1.5 months from the day I submitted my app to start receiving acceptance letters.