It’s 5 one way trips. The article says the trucks run from Dallas to Houston which is about 250 miles according to google. It does mention that over 4 years it’s made 10,000 deliveries but I wasn’t sure if that meant as a company or with the self driving trucks but had a driver in the truck for the 10,000 deliveries. It only specifies that the 1,200 miles has been done without a person in the truck.