TIME UNITS: centi (100 seconds) kaysec (1000 seconds, about 15 Earth minutes) deci (10 kaysecs, about 2.75 Earth hours) day (10 decis, about 28 Earth hours) dec (5 days, cf week) round (cf month - 5 decs/25 days) tenround (cf year - 10 rounds - about 289 Earth days)
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Also, the days of the dec are Onesday, Twosday, Threesday, Foursday, and Fivesday.
Personally I thought I was just deriving the calendar system for a nontheistic society with no sun, moon, or deeply-ingrained religious etymology. And of course, I thought "Twosday" was funny.