Length of one Alautun, longest unit in Mayan calendar

Length of one Alautun, longest unit in Mayan calendar (63.1 million y)

/fact/length-of-one-alautun-longest-unit-in-mayan-calendar

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Length of one Alautun, longest unit in Mayan calendar (63.1 million y)

is 1/5 of Time since the emergence of earliest reptiles (315 million y)...more
is 1/4 of Time since the end of the Permian geologic period (252 million y)...more
is 1/2 of Time since the emergence of flowering plants (125 million y)...more
is 250 x Time since the first modern humans (250,000 y)...more

If this was a standard unit ...