The length of a course is based on two criteria: the number of study hours in the course and your available time to study in terms of hours per week. Note that there are courses of 30 hours, 45 hours, 60 or 90 hours. For example, for a 45-hour course (3 credits), if you study 7-8 hours per week, you should allow approximately 6 weeks to complete the course and submit your exam on the online student center.