Time since the building of Great Wall of China

Time since the building of Great Wall of China (1,800 y)

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Time since the building of Great Wall of China (1,800 y)

is 2/5 of Time since building of the Great Pyramid of Giza / Cheops / Khufu (4,580 y)...more
is about as big as Time since the birth of Diophantus (1,811 y)...more
is 2 x Time since building of Angkor Wat (902 y)...more
is 2 x Time since the birth of Ibn Rushd (Averroes) (895 y)...more
is 4 x Time since the birth of Shakespeare (457 y)...more
is 4 x Time since the birth of Galileo (457 y)...more
is 25 x Time since the invention of the transistor (73 y)...more
is 40 x Time since Concorde Supersonic Airliner entered service (45 y)...more
is 200 x Time since first Tesla Model S launched (9 y)...more

If this was a standard unit ...