I don't know the expression, but it sounds like it means 'I will work hard for many hours'.
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khoffI think it means a college student has decided to enroll in many classes, providing a lot of "course hours." A typical college class that meets three times a week for one hour at a time would equal 3 course hours. You need a certain number of hours in four years to graduate. So an easy semester might earn you only 12 hours, or a really difficult semester might be wor