The amount of credit hours required for a person to be considered a junior in college depends on the school, but it is typically around 60 credits. Certain schools may require fewer or more credits, such as 56 or 58 credits.
The other standard credit requirements are zero to 29 for a freshman, 30 to 59 for a sophomore, and 90 or more for a senior. Each credit hour corresponds to one hour in class per week. It's also expected that a student spend two hours per credit studying and doing homework outside of class. Each college limits the amount of credits a student can take per semester, although the limit can be raised in certain circumstances.