smoking two whole chickens Sunday - my understanding is it should take around 3hrs to smoke. I shouldn't have to add wood chunks if the process only takes 3hrs...am I thinking correctly? Also, I have a GODSM - the wood chip box is kinda small - would you suggest only putting 2 or 3 chunks of wood in? The chucks are prob 1 inch by 2 inch chunks....I've read that the less wood the more smoke you'll get.....