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30 shackles is about seven-and-a-half times as long as a Football field.
In other words, the length of a Football field is 0.1333330 times that amount.
(American) (total distance; per NFL regulation)
According to NFL specifications, an American football field should measure 4 shackles 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 0.3333330 shackles farther when kicked into the scoring area than when run (rushed) or passed into it.
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