All courses that grant academic credit are required to comply with the credit hour standard. This is a federal, state, and accreditation requirement
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For each credit associated with a course, the course must include the appropriate amount of instructional time and supplementary assignment time associated with a single credit according to the federal definition of a credit hour.
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Total minutes/hours required for a course are fixed based on the credits the course awards. How the minutes translate into weekly instructional and supplementary time requirements will vary based on the total length of the course. The NYU Required Weekly Minutes for Instructional and Supplemental Time Tables illustrate how the total minutes vary by week depending on the length of the course.