Well, it depends on who you're seeing (therapist, psychologist, psychiatrist) and why you're seeing them. Mine was a single evaluation split over two appointments, as I'd gone specifically for diagnosis. Most of it consisted of filling out psychological assessments and giving my history to the psychologist.

I'd been referred to the psychologist by my GP because he only does med management, not psychological evaluations. I thought this was the normal way to do it, as I couldn't receive treatment without a diagnosis because my insurance requires a billing code for meds and appointments.