Started my first smoke on my Char-Griller. Everything seems to be going ok. Temps around 230-240. I have started with about 5lbs of lump charcoal. Was wondering how much coals it will take for 6 or more hours. I'm about a hour into the smoke and seem to be burning up the coals pretty fast. I am doing a rack of spare ribs and 2 fattys. Also how long should I be using wood chips for smoke. Thanks for any help I can get.