1 day = 24 hours
1 year = 365 days
1 year = 365x24 hours
For leap year
1 year = 366 days
1 year = 366x24 hours
If the First, Second or Third year is a leap year then, there would be 29 leap years.
Number of hours in 115 years = 29x366x24 + 86x365x24 = 1008096.
But, if the fourth year is a leap year then, there would be 28 leap years.
Number of hours in 115 years = 28x366x24 + 87x365x24 = 1008072.
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