I did not have one. At the Oak Brook site took about ten minutes to get in.
Right now it is taking a long time to get in. I would highly recommend making an appointment. If you have one the line you will go to will be shorter.
Would be preferred but I just never had any luck scheduling one. We waited in line all the times we went. Didn't take long to get in or get an answer to any issues.
Thanks! Your answer is awaiting moderation.