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.
A. Unpaid Breaks. Meal Period: Employees who work six or more consecutive hours a day are required to take an uninterrupted 3 meal break of at least 30 minutes away from the work area. However, schedules for meal breaks are based upon the operational needs of the work area.