The riders for the pony express after how many miles?

The Pony Express riders typically covered about 75 to 100 miles per day, depending on the terrain and weather conditions. The entire route stretched approximately 1,966 miles from St. Joseph, Missouri, to Sacramento, California. Riders would change horses every 10 to 15 miles at relay stations, allowing for rapid delivery of mail across the West. The service operated from April 1860 to October 1861, dramatically reducing the time it took to send messages across the country.