<p>The unit assignments are really just estimates, and they shouldn't be taken as a firm number of hours of work.</p>
<p>A few seminars assign reading, or require students to visit museums or libraries, but I doubt that most advising seminars require four hours of work per week. (Most probably require zero or one hour of outside work in the average week.)</p>
<p>There are 168 hours in a week. That's plenty of time to take four classes, do a seminar, and do an activity or two.</p>