There are a total of four classes on Wednesday afternoons you have to complete in order to get approved for the surgery. They're from 3:00 PM - 5:00 PM.
I started at the beginning of August, but was traveling at the end of the month for work, so I had to complete the last two classes in September. I will say the classes were very helpful in getting me mentally prepared for what I'm going to have to do.
Also don't forget you have to attend at least one Support group on the first Wednesday at 6:30.
This may be because I'm a restarter (started the process once but didn't follow through) but it was my understanding everyone had to complete the classes. I could be wrong.