I mailed in a license renewal for one of my cars on April 21. In years past I got the new sticker back in about a week. After two weeks of getting nothing this time and not seeing the check post to my bank account I started to get concerned. I have two other vehicles coming due soon so yesterday I went down to the tax office to renew them all. The teller looked up the one I tried to renew by mail, and saw they processed it on May 13 over three weeks after I mailed it (saw it finally posted to my bank) and that I should get the sticker on May 21 or 22. That's a whole month elapsed tome. I don't remember it taking that long in the past.
(I still don't have it, BTW)