A note of caution: when scheduling classes for a semester, you should be appraised of the actual work load expected of a three unit class. Each Carnegie unit represents three hours of work per week, meaning that a three unit class should demand 7.5 hours of work per week (in this calculation, an hour is equal to fifty minutes). This means that your fifteen unit load might be expected to create 112 hours of work for you each week. Since there are only 168 hours in a seven day week (counting Sundays), a fifteen unit load could potentially demand that after sleeping eight hours per night, you devote the remainder of your waking hours to academic study.