Time since the emergence of multicellular life

Time since the emergence of multicellular life (2.1 billion y)

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Neat Ratios ...

Time since the emergence of multicellular life (2.1 billion y)

is 4 x Time since the emergence of earliest fish (530 million y)...more
is 5 x Time since the end of the Silurian geologic period (419 million y)...more

If this was a standard unit ...