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<p>1 credit is supposed to mean 3 total hours of work per week, so 15 credits should take 45 hours per week (including both in and out of class time).</p>
<p>In practice actual workloads are lighter ( <a href=“Why College Students Leave the Engineering Track - The New York Times”>Why College Students Leave the Engineering Track - The New York Times; shows a graph with study time of 13-18 hours per week, depending on major; added to class time of 15-18 hours per week gives 28-36 total hours per week). But courses with labs, art studio, music performance, and large term projects typically consume more time than other courses.</p>