In the Fixed Festivity Day Calendar, the twelve months all have exactly 4 weeks that start on Monday. Before every week there may be a single-day Holiday that is not part of the week cycle. Overall there are 30 Holidays, which includes the leap day, i.e. there are only 29 occur in common years. There are 10 Holidays per any 4 consecutive months, which make a hexad of 16 weeks, hence 122 days, with 80 work days (Mon–Fri) therein. A Holiday always occurs before even weeks and before (the first week of) odd months.