How many years is 40 million hours

How many years is 40 million hours

4566

How many days a year, 365 days, 5 hours, 56 minutes and 24 seconds?
In a primary school book, I found that the division of 400 years is Runnian, and I don't know how many days and seconds a year is. I hope someone can give me an accurate answer. What I started to calculate is: 365 + 6 hours - 24 hours / 400 = 365 days, 5 hours, 56 minutes and 24 seconds, because he has one more day every 400 years,
But later, I think it might be: 365 + 6 hours - 24 hours * 3 / 400 = 365 days, 5 hours, 39 minutes and 12 seconds, because there is a 400 year round, and three years in the middle are leap years (calculated every four years), but not leap years,

The earth's orbit around the sun is 365 days, 4 hours, 58 minutes and 56 seconds (that is, the exact time of the Gregorian calendar year). The second algorithm is closer. It not only uses leap years to adjust the error, but also uses jump seconds to adjust it (that is, a certain minute is 61 seconds)