One more data point. Two passports mailed in same package (but in separate internal envelopes). A month (30th to 30th) from them receiving to me receiving, 3 extra days if you count from when I dropped at USPS.

• Expedited application, passport+card, no overnight return, $200
• July 27 mailed priority mail
• July 30th late night/31st delivered to national passport center
• August 3 received and "in process", "reviewing documents"
• August 30 "approved", "we're now printing", should receive around September 4
• (checked on Friday 27th, still said reviewing documents, but didn't check over the weekend)
• August 30 priority mail dropped two passports in my mail slot (website still says 9/4)
• September 2 passport cards arrived
• September 17 old passports and passport cards arrived bundled
• Signed up for email notices, never received one
• [edited to update the last two item dates]

I can't complain about my experience. Now just need to update GE but I read on another thread I should wait a month for some reason.