A 73-day (7+3=10=5*2) period of the year. Each season has its own holyday, plus one for an apostle and maybe several more, plus a bunch of whollydays that round the hole thing out quite nicely.
Pentagon of the Year[]
The year cycles through a pentagon, progressing from the primordial Chaos and Discord, teetering for a time on the edge of Confusion, and then slipping into Bureaucracy before we have to clean up the mess during The Aftermath.