My experience if it helps

Applied 11/02/16
Conditional approval 11/11/16
Interview/Final: 12/31/16 at EWR

Got the email with approval within maybe 2-3 hours of interview, even on a "holiday" of sorts. Wanted US Customs House in NYC as it's down the block from my office but interviews were booked up until March 2017 at the time.

Got there a bit early so had to wait until interview time (maybe 20 minutes?) as they took bunches of 5 at a time. Asked me my job title/how long I had been working there and if I had any travel planned I believe. Out within 10 minutes.