A college instructor abandoned his teaching duties when he was in the zone working on a test bank. Normally scheduled to teach nine hours per week during the semester, he generally made his way to one three hour class a week, one where his students could propose devious problems that were sure to confound generations of test takers. What is the test bank author's utilization for his teaching duties?

Question $39$ options:

three hours

nine hours

$33\%$

$300\%$