Refunds are calculated by calendar days and include Saturdays, Sundays and holidays.
Courses with 70 or more calendar days:
100% refund     21 calendar days from the start of the class         Deadline Sept 7th
50% refund       7 calendar days following end of 100% refund date       Deadline Sept 14th
0% refund         Begins at the end of the 50% refund period