Typically, one calendar year is taken as 52 weeks, since 52 × 7 = 364 days. Therefore, two years are about 104 weeks. However, a common year has 365 days and a leap year has 366, so two specific years contain 104 weeks plus 2 or 3 extra days. Over long averages, two years ≈ 104.29 weeks, on average overall.