My appointment was at 09:30, and I was there at 09:00. Security Check and initial entry took 15 minutes. Waited in the big room for an hour before being called to a window to submit remaining documents (updated police certificates and individual/family documents). Another hour passed before being called in for the interview which took all of 15 minutes. Straightforward since we have kids, and only few questions about the co-sponsor and presenting concrete evidence of our intent to move and reside in the US.