I am in Canada so things might be a bit different.

We had 2 days of testing, the first day he did psych-ed testing, including an IQ test. He also meet with a speech language pathologist. The second day he did the ADOS (which is the autism screening test). We met with a developmental paediatrician who checked him out physically. There was a team meeting (which took about an hour) and then they met with us to give us the diagnosis.

There was also a bunch of paperwork I had to fill out before our appointment.