The 54-Week Calendar contains exactly 54 weeks per year. Some weeks are shortened to 6 days, though. In a leap year with 366 days, all adjacent months contain exactly 9 weeks (or 61 days) together and every month has at least one week with only 6 days in it. In common years, there is a 13th 6-day week, which is the last one in the last month.
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