I replied, that honestly I don't know, but that it's about 300 university credits. I've studied on and off for seven years, and I'm certainly not ashamed of my academic background. The interviewer, however, did even not know how many years of studies, the number that I answered that I though it was -So why ask? Also, I'v never received this question, cause whenever that's been relevant, it has been clearly posted in the ad, that you should bring a certificate(which also would have saved her time to ask relevant questions, since the interview was so short).