I am new the green egg community and have a quick question: I am still using the big green bag of lump charcoal that came with my new egg. I use a large Weber chimney device to get the coals started and I estimate it's about a quart size container of lump.However, I can't seem to get my fire to last longer than about 5-6 hours. Is this normal? I have cooked two Boston Butt cuts of pork and have had to start fires at least twice each time I use the egg.Thanks for your time!