The number of study hours needed can vary depending on a variety of factors, such as the subject being studied, the level of difficulty, the individual’s learning style and aptitude, and the desired level of proficiency.
As a general rule, it is recommended that students spend at least two to three hours of study time outside of class for every hour spent in class. This means that if a student is taking a 3-credit course that meets for 3 hours per week, they should spend an additional 6-9 hours per week studying outside of class.