Regular service for non-expired renewal of passport book:

7/31: App sent via USPS
8/8: Received for processing (really slow transit even
though I paid for 2-day shipping. I actually filed a
claim and recouped costs and the tracking to this
day still says the package is in transit)
8/9: Check was cashed
8/10: Processing application status on website
9/3: Received email about processing status
9/4: Received email about approval status and
imminent printing with expected delivery date of
9/9

Just a little less than 4 weeks from receipt to approval and probably 4.5 weeks door to door (not including the unusually slow transit time to the processing center)