Time since first humans in Australia

Time since first humans in Australia (50,000 y)

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Time since first humans in Australia (50,000 y)

is 1/5000 of Time since the end of the Permian geologic period (252 million y)...more
is 1/4000 of Time since the end of the Triassic geologic period, mass extinction (201 million y)...more
is 1/2500 of Time since the emergence of flowering plants (125 million y)...more
is 1/5 of Time since the first modern humans (250,000 y)...more
is 20 x Time since the birth of Socrates (2,490 y)...more
is 20 x Time since start of building of the Parthenon (2,466 y)...more
is 25 x Time since the birth of Hero of Alexandria (2,012 y)...more
is 40 x Time since the birth of al-Khwarizmi (1,244 y)...more
is 200 x Time since the birth of Joseph Fourier (254 y)...more
is 200 x Period of Pluto's orbit (248 y)...more
is 200 x Time since birth of Sophie Germain (246 y)...more
is 250 x Time since the first iron steamship crossed the English Channel (200 y)...more
is 250 x Time since the first passenger steam railway service (197 y)...more
is 400 x Time since birth of M. C. Escher (124 y)...more
is 2000 x One average human generation (25 y)...more
is 5000 x Time since first Tesla Model S launched (10 y)...more

If this was a standard unit ...