I'm anxious to try out my newly acquired "used" 18.5 WSM. I bought a 9.5lb. Brisket and it's going in tomorrow morning. Any info on how long I might be able to get out of full bag of unlit Kingsford using about 1/3 lit in minion method? From what I've read, it looks like I should expect about 45 min. Per pound or about 7 hrs if I can hold about 225 degrees. Will the full bag last for a cook that long?