There are 7 days in a week so there are 3647 days in 521 weeks. There are about 365.256 days in a year so 521 weeks is about 9.98 years.
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10 years 120 months 521 weeks 3,652 days 87,658 hours 5,259,492 minutes 315,569,520 seconds
1 ordinary calendar year = 521/7 weeks 1 leap calendar year = 522/7 weeks
there are 211 weeks in 4 years and 3 weeks
521 = DXXI
0.0038