Ten 36-day months, each with five seven-day weeks. The last day of each month is a holiday. The left-over five/six days at the end of the year are a holiday. The year begins the day after the winter solstice so new year's eve night, the culmination of the year-end holday, would be the longest night of the year.
Oringinal post: http://mbarrick.livejournal.com/790135.html