The word Month is used most often for the 28-day month, however, it’s used more broadly to apply to periods ranging from 18 to 60 days. Some have names, like hōra, house, term, and semester, however, for those that don’t the word Month and its duration in days will suffice for now.
Each Month (20) is composed of four 5-day weeks.
Clockwise from bottom
Counter-clockwise from top
Rethinking Time 