It is 6 decades = 60 years
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Assuming none of the years is a leap year, 18 years would be equal to 24 x 60 x 365 x 18 = 9460800 minutes.The minimum number of leap years in an 18 year period is three. For example, in the period between 1889 and 1907, there were three leap years. This would be equal to (24 x 60 x 365 x 15) + (24 x 60 x 366 x 3) = 9465120 minutes.The maximum number of leap years in an 18 year period is five. For example, in the period between 2000 and 2018, there will be five leap years. This would be equal to (24 x 60 x 365 x 13) + (24 x 60 x 366 x 5) = 9460800 minutes.
One century is more than six decades. A decade is a period of 10 years, while a century is a period of 100 years. Therefore, one century is equal to 10 decades, making it a larger unit of time than six decades.
The period of 51 years backwards from 2013 contains 13 leap years and 38 regular years. There are 60 seconds in one minute, 60 minutes in one hour, 24 hours in one day, 365 days in a regular year, and 366 days in a leap year. Therefore, 51 years is equal to (60 x 60 x 24 x 365 x 38) + (60 x 60 x 24 x 366 x 13) = 1609459200 seconds.
A DECADE is a period of TEN years. Hence 6 decades = 6 x 10 = 60 years. In a Table form 10 years = 1 Decade 10 decades = 1 century ( 100 years) 10 centuries = 1 millenium ( 1000 years).
60 months is five years.