On average, a healthy and well-trained horse can run about 2 to 2.5 miles at full speed without halting. Still, this top-speed sprint isn’t typically sustained unless under racing circumstances. Remarkably, some horses, when prepared for endurance, have demonstrated the capacity to cover distances up to 20-25 miles without stopping, though at a slower pace like a trot or canter.

An average horse can reach a top speed of about 25-30 miles per hour.

No human is running that far or fast in any race. And sure a human ( a small percentage of humans at that) can go farther than 25 miles without stopping, but by the time you catch up to where the horse stopped, it would have had time to eat, drink, rest AND leave before the human got there