Ours never last that long- stuff like chicken legs are gone in minutes. Aside from when we used to give them the smoked beef leg bones (which we never do anymore after learning the difference between a cooked and raw bone, and the difference between a weight bearing bone and a non weight bearing bone) the longest I had one last was a big pork shoulder, it took my GSD about an hour to go thru that one. Sometimes the short ribs will last too but I take them away if hey get too small so they don't try swallowing too big a chunk. I think a dog has a pretty tough stomach, and if a bone has some meat on it and it sits out all night, they can still eat it. I'd leave it outside though!