My wife is a high school basketball coach and she wants to get the girls over and feed them pizzas and do some team bonding. Well I get to cook the pizzas that they make. I was wondering how long a full load of lump would last at 600 degrees? I think that i will be making 10-15 pizzas. Can i do that in one load? or do i need to have a chimney full of lump ready to refill the egg after a certain amount of pizzas? Thanks all and i promise to post pics of the cook.