Time since first domestication of horses

Time since first domestication of horses (5,500 y)

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Time since first domestication of horses (5,500 y)

is 1/500 of Time since the emergence of earliest humans (2.8 million y)...more
is 1/20 of Time since the start of the last glacial period (Ice Age) (110,000 y)...more
is 1/5 of Time since first domestication of dogs (27,000 y)...more
is 10 x Time since the birth of Albrecht Durer (551 y)...more
is 10 x Time since the birth of Copernicus (548 y)...more
is 10 x Time since the Caxton's first edition of Chaucer's The Canterbury Tales (546 y)...more
is 40 x Time since birth of Emmy Noether (140 y)...more
is 50 x Time since the birth of chemist Dorothy Hodgkin (112 y)...more
is 50 x Time since the birth of Turing (110 y)...more
is 50 x Time since the first fixed wing scheduled air service (108 y)...more

If this was a standard unit ...