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.
Twenty states, plus Guam and Puerto Rico, have laws requiring lunch breaks for employees. However, these laws vary from state to state. For instance, Illinois requires a break of at least 20 minutes, no later than five hours after the start of the work period, for all employees who work 7 1/2 hours or more in a shift.