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.
For the suspension bridge design, the main span was to be 1,750 feet, flanked by side spans of 719 feet. For the cantilever bridge design, the main span was also to be 1,750 feet, but was to be flanked by shorter side spans of 500 feet. Both bridges were to have mid-span clearances of 135 feet over mean high water. By 1922, Modjeski's suspension design was approved by the Delaware River Bridge Joint Commission.