There is no special name for such a unit. You might call it a hectoyard, but this is not commonly used. Rather, such a length will be measured in feet or in yards; larger measurements are measured in miles.
Actually, 100 years = 1 century, much the same as 10 years equaling a decade and two weeks being a fortnight.
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Ten Years Equals A Decade, 100 Years equals A Century.
1/100 of a century equals one year. One hundred years equal a century.
100 years
It is: 1/100 times 100 = 1
It equals centry