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.
While federal employment laws do not require employers to provide meal breaks, Illinois labor laws about breaks require them for all employees who work a shift longer than 7.5 hours. If you work more than 7.5 hours in your shift, IL labor laws about breaks require that you be given a meal break of at least 20 minutes. You are not required to be paid for this break according to Illinois labor laws about breaks. In some cases, your employer may have a union contract or an individual employment agreement with employees that specifies a longer meal break.