It might surprise some to know that federal poultry regulations allow a chicken under 3 or 4 pounds a full 8 hours to get down to 40F (12 hours for above 4 pounds) and an additional 4 hours at 40-50 during the cut up process. That's a big reason why food safety is stressed so heavily on the kitchen side of things, because you have to assume your chicken has already sat for up to 14 hours above 40F if they come from a federally inspected facility. It's also a big reason why we never send our chickens to a processor. Usually a small scale processor is much faster than that, but they aren't required to be, so there is no guarantee.