I agree with Frank and Paul above. Study time is very personal to the student. What is your learning style? For example, when I was a college student, just going to class and taking notes was huge for me, because when it came time to study for the exam later, I could remember that day in class and it helped me with recall. Re-writing your notes, using index cards or doing sample problems (depending on the course) are all helpful. The amount of time doesn't matter so much as the way that you study - an hour of work without distractions can be hugely beneficial, whereas a whole afternoon with social media, games etc. might not be as helpful. Take advantage of the resources at your college like the tutoring center (at CCP, where I work, this is called the Learning Lab). You can get free help with preparing for exams, editing papers etc. Generally, about a 1-3 hours of studying per course you have would be the average. So, if you're in 5 classes, plan to study outside of class for 5-15 hours total. Good luck!