How often should you add Fresh Charcoal? Can you add it as is, or does it need to be lit?

As charcoal burns, it gradually generates less and less heat. In general when you are using a prolonged cooking method, the coals need to be replenished once every hour. Charcoal briquettes may last a little longer; lump charcoal may burn out a little more quickly. When using lump charcoal, you can add fresh charcoal directly to the lit coals. Leave the grill uncovered for five to ten minutes while the lump charcoal lights.