Semester-length credit courses are based on a 16-week semester with the last week set aside for finals. A three-credit course meets for 150 minutes a week; a two-credit course, 100 minutes; and a one-credit course, 50 minutes. Activity and lab courses require longer class sessions. Classes that meet for more than 100 minutes in a single session usually schedule a break during the middle of the class. Instructors should base their breaks on the needs and interests of the students.