That's the impression I got (not that they're in class 8 hours a day everyday, but that it's a pretty good chunk of time), and I spoke with a student who goes there who said pretty much the same thing. This is what he said (verbatim, through PM): "Anyway, yes, we are in class a lot. I'd say that most days we have between 4-8 hours of class. Some weeks might have as many as 30 hours of class time, others around 20. But, 20 is definitely the lower limit."
So it looks like students at Pitt are in class quite a bit, certainly a lot more than students at Case. But I'm with you...I do tend to obsess over small, probably minor differences in schools, but at the same time I don't think the amount of time you're in class (especially if you're in PBL, which surprisingly a lot of students find to predominantly be a waste of time) is such a small issue if you're the type of person who prefers having a lot of individual study time to having little individual study time. I guess I'm just a little concerned of being burned out from spending all day in class that I'll be less inclined to study...having never been in med school before, it's so hard for me to know what would be a good fit for me.