One of my shops sat in QC status for 17 days once. Everything done the same day and after it was approved. That one just sat there in QC. Then the last day of the month, it suddenly just changed to approved. I was never contacted or asked a question about it. I've had a lot of reports sit in QC for a week but never got a question. It's been my experience that if a question is coming, it comes very quickly, like within hours or within a day, except twice when the questions came from the client. Both those times, the reports were approved and then a week later, and 3 weeks later for the other, QC emailed me the client's question. Both times, I answered and they basically said okay, thanks, and I never heard any more and got paid.