A student may add a course to his or her schedule during the course's Add Period. This Period is the first ten (10) calendar days of either the fall or spring semester, if the duration of the course is equal to the duration of the semester. For all other courses (those not equal in duration to a semester of which they are part), the duration of the Add Period is calculated by multiplying ten (10) days by the duration of the course (in days) divided by seventy-five (75) days, and then rounding up to the next higher whole number of days. A course may not be added to the student's schedule after this Add Period, except under the following conditions: