I'd say about ten decades, or 100 years, or 1 century.
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60 years. One decade is 10 years.
80 years, since a decade is 10 years.
10 decades in 1 century
Decade is a period of 10 years 103 divided by 10 = 10 decades
There are 70 decades in 7 centuries. This is because each century consists of 10 decades, so when you multiply 7 centuries by 10 decades, you get a total of 70 decades.