At viri it was discovered that there are 290 glyphs from Aa4-71 up to and including the viri with cut off top end, which means that between these two glyphs there are 288 glyphs:
Although 288 = 8 * 36, it is more reasonable to count with 2 glyphs per day and then find 288 to be equal to 4 * 36 = 144 = 12 * 12 days. Because Aa4-71 seems to be located in the middle of summer and the 'cut-off' viri at the end of the year. Furthermore, with 2 glyphs per day 462 will be equal to 231 days.
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