Mailing from coast-to-coast sounds like it would take a long time, but there are regular flights cross-country, and the sorting facilities bring mail to the middle of the coast, and then ship it straight across, east or west, depending. This means that the mail has to go first to a central sorting facility.
Truck and bus drivers must generally take a minimum of eight hours off between shifts, and their shift hours are often capped. Airline pilots are required to have 10 hours off between shifts to allow for transportation and rest time.
State Laws. Federal law does not require breaks and meal periods, but virtually all of the states have labor laws that contain provisions for mandatory rest periods for breaks and meals, making it unlawful to require that employees work a straight shift of eight hours. The state laws vary. For example, California employers are required to give employees a 30-minute meal break after five hours of work, unless the employee's shift is only six hours. In New York, the state law requires a one-hour break during the middle of the day, or around noon, for factory workers.