The average horse will have a certain degree of fatigue.

It depends on how far the horse's physical strength allows it to run. The horse with the best physical strength is a swift horse. It also depends on the speed of the horse and how long it takes to run a thousand miles. After running for two days, you will be exhausted in two days. If you run for a day, you will be exhausted that day. The general 800-Li Chong, 600-Li Chong, meets a swift horse, never dies, and will arrive in a day or two. However, you can't find such a good horse in a general post station, and it's hard to find a maxima. Usually hundreds of horses. A hundred-mile horse can run hundreds of miles, which is different. If 800 miles is urgent and a horse can only run 600 miles or 400 miles, then one or two horses will die on the road.