Our appointment was at 7:15am but we got there around 645 and we're checked in by 7, surprisingly quite a few people were there already or shortly after. We got called in at 745 and swore in; the officer asked all the "no" questions on the i-485 then asked us about our relationship how we met etc. she was very friendly; it was more like a conversation than an interview, after that she asked for any evidence I had brought. She quickly flipped through everything, said thank you and congratulations you are approved. All in all we were in the room for maybe 10/15 mins