Four hundred.
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91 times, leaving a remainder of 4.
There are 459 weeks and 4 days in 9 years, because there are 3287 days in 9 years, because of leap years. Then divide by seven and you get 459 weeks and 4 days.
459 factored
Since a 4 x 8 panel is 32 sq. feet, and 459 divided by 32 = almost 15, you would need almost 15 panels.
498