I was one of the last ones to go trough the interview process, the Embassy was packed but there were only like 20 K-1's waiting. Although it was an hour long wait and extremely nerve-wracking (as I saw a lot of people getting the yellow and pink letters).
The interview was extremely short, only 4 questions and I got my approval! I must say we got a ton of evidence and we've been together for 5 years plus a ton of visits and family photos.
Consulate / USCIS Member Review #30262
Review on October 15, 2021:
