How many weeks in 13 years?
Including January and March, it's 13 weeks. In regular years it is 12 weeks and 6 days, and in leap years it is exactly 13 weeks. If referring to the period from the beginning of January to the beginning of March or from the end of January to the end of March (or middle to middle, etc.), it is eight weeks and three days in regular years and eight weeks and four days in leap…
676 * * * * * No. The above answer is based on the incorrect assumption that one year is 52 weeks. It is not. It is 52 weeks and 1 day (or 2 in a leap year). These additional days add up to 2 more weeks plus a bit over a 13 year period. So allowing for a leap year every fourth year, 13 years = 678 weeks (plus 2 or 3 days).