How long should a first appointment with a specialist take?

I’m going to see a Hematologist tomorrow and was told it would most likely take almost an hour and a half – actually with the doctor. I was expecting it to take that long with the waiting time included. As they put it, he’s ‘very thorough’ and wants to make sure he ‘has everything right’. Apparently he does this with all his new patients.

What I’m wondering is, what the crap could he possibly need that much time for? I’ve can’t remember the last time I went to a specialist, I was a kid so is that normal for specialists?

I’m kinda expecting a few questions, some background and some blood drawn the end. I was thinking 45 min. Anyone got any experience with this sorta thing? What should I expect?