Except as provided in paragraph 83, House Officers shall be entitled to twenty-eight (28) days of vacation time per twelve (12) months of employment, inclusive of weekends (Saturday and Sunday). Therefore, a maximum of twenty (20) of these twenty-eight (28) days will occur on a Monday through Friday schedule. In the event a Program assigns and schedules vacation time by the month, no more than thirty-one (31) days of vacation time, inclusive of weekends, will be provided.