100 years = 1 century so 420 years = 4.2 centuries.
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420 months.
There are 100 years in a century. There are 1000 years in a millennium.
A century is 100 years.
A century is one hundred years.
1 year == 365 days10 years = 3,650 days100 years = 36,500 days200 years = 73,000 days400 years = 146,000 days+ 20 years = 7,300 = 153,300 days in 420 years.