I only talked to him on my own for an hour or so I think. Then he saw my family too.
That was the only time spent in the actual assessment, although I'd filled in questionnaires and stuff for him beforehand.
I might be wrong about the cost. It was expensive though, because I'd probably still be waiting now if I'd got it on the NHS, and the guy I saw was an AS specialist who's had work published on it and seemed to know what he was talking about. It was worth it, but not something I could afford if I wanted to keep seeing him I think