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Is 855 spans as long as a Football field?

It's about one-and-four-fifths times as long as a Football field
The length of a Football field is about 480 spans.
(American) (total distance; per NFL regulation)
According to NFL specifications, an American football field should measure 480 spans 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 40 spans farther when kicked into the scoring area than when run (rushed) or passed into it.
There's more! See other comparisons to 855 spans...