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.
Oregon law, in contrast, requires a half-hour break for each work period of 6 to 8 hours, and specifies that the break must come between the second and fifth hour for work period of seven hours or less and between third and sixth hour for work periods longer than seven hours.