Once a century. Century means 100 years.
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A Century is 100 of something
A century has 100 years; so 25 years is one quarter of 100 years.
1/100 of a century equals one year. One hundred years equal a century.
It is equal to one millennium which is a 1000 years because a decade is 10 years and 100*10 = 1000 years
There are 100 years in one century!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1