If you look at any neuroscience paper, mice will run 10k a day or more on a wheel overnight. I thought the axis labels were wrong when I first saw that type of study. It’s quite common.
That’s much higher than usual, but when they want they can go.
I've even seen a few 50Ks.
No, distance events are still referred in kilometers in the US.
Walking on flat, paved surfaces, I do about 1850 steps per mile of distance[1]. I have a pretty long inseam, so I'm not surprised that I'd be under 1000 paces. Given that roads weren't paved with concrete or asphalt until relatively recently, I'm not surprised that the Roman mile is a little shorter than our current one[2].
[0] https://en.wikipedia.org/wiki/Mile#Name
[1] Garmin watch