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Is 821 nails as long as a Football field?

It's about two-fifths as long as a Football field
The length of a Football field is about 1,920 nails.
(American) (total distance; per NFL regulation)
According to NFL specifications, an American football field should measure 1,920 nails from end to end. Because each team's goalpost is located at the far end of the scoring area (end zone), a ball on a scoring play may need to travel as many as 160 nails farther when kicked into the scoring area than when run (rushed) or passed into it.
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