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.
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365 days = 8760 hours 8760 hours= 525600minutes 1 year = 525600 minutes 18 years = 31536000 minutes
365 x 18 +4 = 6574 days. 6574 days x 24 hours x 60 minutes = 9466560 !9,467,280 minutes
Exactly 18 minutes in 18 minutes.
1 year = 525600 minute 18 year = 9460800 minute
The number of minutes in 75 years depends on the definition of a year:For the calendar years, assuming there are 18 leap years,75 years = (57 x 525,600) + (18 x 527,400) = 39,445,920 minutesFor simply Julian years of 365.25 days, the number of minutes in 75 yearsis 75 x 525,960 = 39,447,000 minutesFor the SI year (31,556,926 seconds) each year contains 525,948.77 minutes. and 75 x 525948.77 = 39,446,157.5 minutes