I've done this cook many times always finished within 4-5 hours not yesterday. Had a 16 lb brisket I was going to do for a friend. Well, since I have an 18.5 the brisket was too big to fit on the grate so in my ultimate wisdom I decided to put something on the grate to lift the center of the brisket up and create a sort of a bridge so it would fit. Little did I know that it would just about double my time. Couldn't imagine for the life of me why it took so long to get to the wrap temp. Then it seemed to take forever to get tender. Yes, I took the bridge out before I foiled . The meat was laying flat after foiling. Took 9 maybe 10 hours to finish. The only thing I changed in my cooking was the bridge. I'm thinking that the bridge, since it lifted the meat off and away from the heat, was the reason for the length of the cook. What do you guys think??