How long is from fingerprints to citizenship interview 2008 NEWARK?

I sent my N400 to the Vermont center on Apr 10, 2008. Fingerprinting was done on May 14, 2008 in Hackensack, NJ. I finally received my interview letter on Oct 3, 2008, and my interview is scheduled for Nov 6,2008. So it looks like it is a 7 month process from the letter to the interview. Hope that helps!