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.
A 2x6 16OC is only rated. for 30 live floor load to about 11'2. A 20 foot span 16. OC need at least. a 2x10 for a 30 pound live load. For a 20 lb live load, limited storage with SYP joists 16. OC is good to. about 14.5 feet of span. This calculation includes the weight of a drywall. ceiling under the joists. 20 foot span 16. OC need at least. a 2x10 for a 30 pound live load. For a 20 lb live load, limited storage with SYP joists 16. OC is good to. about 14.5 feet of span.