How long mail takes is going to depend on many factors along the way. Many factors, indeed, though with regard to how long does priority mail take, the answer is, not long. In fact, the United States Postal Service says your package or envelope will arrive within two days.
Both the 2009 IRC and the DCA6-09 allow #2 southern pine 2x10s to span 13 feet 1 inch at 24 inches on-center at a design load of 50 psf. That means these joists can span the 12-foot depth of the deck, and the beam can be located at the perimeter. Nine joists will be needed for the 16-foot width.
Length of suspension span including main span and side spans is 1.2 miles (6,450 ft or 1,966 m). Length of main span portion of suspended structure (distance between towers) is 4,200 ft (1,280 m). Length of one side span is 1,125 ft (343 m). Width of Bridge is 90 ft (27 m).