2609 weeks.
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It depends on when you start - whether in a leap year or not, whether your time span includes a xy00 year or not. So there is no simple answer.
5478 or 5479 days - depending on how many leap years the 15-year span contains.
2191 days in 6 years if there is one leap year in the span (the third year), otherwise 2192. (365x6 plus the one or two leap days)
52 weeks times 11 years is 572 weeks. OR-There are 365 days in a year, times 11 gives 4,015 days less two days for the two leap years that would occur in eleven years. 4,013 divided by 7 is 573.3 weeks.* * * * *OR you might prefer a correct answer.365 days in an ordinary year. Any 11-year span will include 2 or 3 leap years. You therefore ADD 2 or 3 days giving a grand total of 365*11 + 2 or 365*11 + 3 days. That is, 4017 or 4018 days.Divide by 7 to give 573.86 weeks or 574 weeks.
Given a span of four years includes three normal years and one leap year, 4 years consists of (365 x 3) + 366 = 1461 days.