I had a similar experience. I went into renew mine at the beginning of Nov 2010. The temporary license was good for 6 weeks. When it was 4 days from expiring and I still hadn't received the permanent license in the mail, I called DMV and they said that the application hadn't been completed, and I would need to come back to the office. Prior to my phone call, there was no attempt on their part to notify me that there was a problem. When I went in to the office, it turned out that the DMV worker I initially met with had forgotten to check the box that said I had passed the eye test. So I wasted an hour and a half taking off work just so I could walk in the office and wait for them to check the box.
After that I think the license came within about 3 weeks.