i think that you should expect a long time at the doc's office. when i was doing "intake" interviews when people didn't have alot of info about themselves we had to ask alot of questions. plus all the paperwork you have to do-offices are different, if you have to do the paperwork it will take as long as it takes you to fill it out then the doc has to go over your answers. others go over the questions with you and sometimes that takes longer.
but it's great that you are going, they are there to help you and even if the 1st appt is annoying the end result will be good.