I had YSC as well and it took forever. I finally had my interview last week. It was a combo interview for my citizenship as well. The interviewer we got was tough. Before we went there I was more nervous about the test than the interview part just because I felt like we had so much more evidence than we had for the first GC (now we own house, cars together etc. ) and thought our case was easy... and yet the interviewer kept asking for more and didn't seem to be satisfied the whole time, even wrote down all the months/years my husband and I were mentioning about how/when we met and our lives to make sure our timelines lined up. Asked so many questions, lots of details. So when we got to the citizenship test questions, it felt so quick and easy compared to the interview itself. I got approved but I just felt down when I was leaving. I'm glad this process is done and we won't have to deal with this anymore.