Time since the birth of Marco Polo

Time since the birth of Marco Polo (770 y)

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Time since the birth of Marco Polo (770 y)

is 2/5 of Time since start of building of the Colosseum (1,950 y)...more
is 2/5 of Time since the peak of Roman Empire (1,900 y)...more
is about as big as Time since the birth of Dante Alighieri (759 y)...more
is 2 x Time since the birth of Newton (381 y)...more
is 4 x Lifespan of Galapagos giant tortoise (190 y)...more
is 5 x Time since the publication of Volume 1 of Marx's Das Kapital (157 y)...more
is 5 x Time since the birth of physicist Marie Curie (157 y)...more
is 10 x Time since the invention of the transistor (76 y)...more

If this was a standard unit ...