personally, for me, i've taken no less than 6 classes per semester including labs since my freshman year, and now i'm taking 8 classes including labs and undergraduate research (counts for 3 credits). Since exams haven't come around just yet, I can't really say how much time I will spend studying for all my classes, but I can estimate about 3-4 hours for every class, for two days studying for each exam. That is to say, 3-4 hours x 2 days x 7 classes (not including undergrad research) = about 42-56 hours every exam block (weeks of exams for each class). This doesn't include reading for classes and doing homework and lab reports and whatnot. So definitely more time consuming when exam time comes around.
You also have to take into consideration that general chemistry is easier than organic chemistry, so when you take the general courses, it will be easier than the upper level courses, so you won't need to spend as much time on general courses than you would upper level courses. Which begs to say that freshman year, you should bunker down, start your freshman year focused on doing work and doing it well, because it can only get harder from freshman year out if you stay on top of things. That way, you have somewhat of a buffer for your GPA and you begin a steady, focused work ethic that can only help you later on.
but remember, this is just for me. Some people need to study more, and others less. Personally, I have plenty of time for my social life, clubs, research, and everything else in between. Just stay focused and motivated, and you'll be fine! 🙂