Where are you getting these numbers from? Gwern[0], citing this paper[1] and John Bradshaw's book "Cat Sense" (note: I haven't read this book myself), gives much smaller numbers than that. Still much larger than what you'd find inside, but nowhere near the 500m (average!) or 1500m that you claim.

[0] https://www.gwern.net/Cat-Sense ; search for "91 meters"

[1] https://www.gwern.net/docs/catnip/2020-kays.pdf