Adjustment of Status - I-485

So I had my interview today, It’s a marriage based case they brought husband and me into offic along with our attorney IO was nice she asked very little questions nothing like where we met or anything similar, she took most of the time asking about most of the time asking about my traffic citations and what happened at each one. After that she asked basic questions and because I’m under 245 I i have to prove that my mother was here back in 2000 and the documents I had were not good enough for her because they were copies but they were rent receipts and that’s all my mom had. So she said she will send me a RFE has anyone been through this at interview? How long would I have to wait till I get a decision. I’m a little sad.