In and out in one hour. AOS Interview was scheduled for 1pm. Arrived on federal building at 12:15pm. Had to do airport-style screening in front door. Went up to 14th floor to sign in and wait in comfortable room with a few other AOS/N-400 applicants. Got called in at 12:40 and was interviewed by middle-aged Asian lady.
Interview took 15 minutes. No photos reviewed; just pay stubs, identity documents, and very simple questions. Very straightforward and professional. There was a bit of concern over the date that our officiant had used in the California marriage certificate, but the IO admitted she wasn't familiar with CA procedures.
Walked out of the building by 12:55 confident that we passed. Sure enough, uscis.gov just sent card production notice.