15625/52 = 300.480769
About 300 and a half years
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If by "cube of 15625," you mean 156253, then you would multiply 15625*15625*15625. If you have to do this by hand, then first multiply 15625*15625, and then multiply the product of that by 15625 again. Follow the multi-digit multiplication rules, look it up if you don't know them.
253 = 15625
there are 211 weeks in 4 years and 3 weeks
681 weeks is 13.1 years.
2 years and 2 weeks