How many years are in a week?

Answer 1

Except that we're supposed to answer the questions that are asked, not the ones we think people should ask. There are 0.019178066428986 years in a week. And leap days are added because of the length of a day, not because of the length of a week.

Answer 2

I think the question should be the other way round! There are 52.1429 weeks in a year. Which is why a leap Year of an extra day is added every fourth year to bring the calendar back into line. In a Leap Year, there is a February 29th added.