Depending on the number of leap years that fall into the 10-year cycle (2 or 3), there are 521.74 or 521.86 weeks.
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75 weeks is about 1.437 average years.
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There are 52 weeks in one year. Therefore, 6 years is equal to 52 x 6 = 312 weeks.
1 year = 52 1/7 weeks (not counting leap years) 21 years = 1095 weeks (with some days left over if you are counting leap years) ■
Assuming three consecutive years of no more than 52 consecutive beginnings of a week, 143 weeks is equal to 143/52 = 2.75 years.