Is this normal? Taking forever for doctor’s appointments

In July my son was referred to a psychologist from his pediatrician to be evaluated for adhd and autism. We just now had the appointment last week, it took that long to get an appointment. She evaluated him and I filled out probably 50 documents and his teacher did as well. Now I am being told they won’t have the “results” until November 30. Is this normal/typical? Taking literally 3-4 months to diagnose autism…?