It really depends on who you are. Class is 2-6, rarely goes til 6. I think once or twice it's gone that long. Usually 5ish.
I wake up and watch the news, breakfast, etc. Shower and then go to class. I have classmates who wake up, go straight to the library/coffee shop -- study from 8am-2, class 2-5ish, and then right back to the library/coffee shop until 11pm. And they repeat this every day almost.
I'm more of the crammer. I study the weekend before the tests, maybe a few days prior to that as well - and I have a 3.5. So it truly depends on who you are. If I had put in more effort, I could've gotten a 4.0 for sure - first semester isn't that bad.
Second semester, the anatomy - so far, is brutal and it only just began. I've taken anatomy before, but this is just a mile a minute - and quite overwhelming. I'd suggest doing anything anatomy related if you can. If you don't, it's not a huge deal. It's kind of hard to prep for anatomy - especially when you don't know how the teachers teach it and how they're going to test you on it.
My advice is aim super high first semester, so that you can have a few screw ups second semester and still be fine. My 3.5 will allow me to have a few screw ups and still be fine. But those who are right around the 3.0 are really sweating this semester I'd bet. I've heard pharmacology is brutal too - but we haven't had a class on that yet.