That would be 4. A score equals 20 years.
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Assuming an 80 year span includes 20 leap years, then 80 years is equal to (60 x 365 x 24) + (20 x 366 x 24) = 525600 + 17280 = 542880 hours.
A score is 20, so 4 score is 80.
There are eight decades in 80 years. A decade is a period of 10 years, so to determine how many decades are in 80 years, you simply divide 80 by 10. This calculation gives you 8 decades in 80 years.
80 80 * 10000 = 800000
80