I'm smoking a brisket for the first time and it's for my wife's birthday party. I have a pellet smoker that I'm using to smoke a full brisket. I put it on roughly at 10 PM last night. Following suggestions I found at amazingribs.com, I'm supposed to remove the brisket when it's at around 195-203F and put it in holding, that is, wrap it in foil, then in a towel, and place it in an insulated cooler. He suggests 1-4 hours for holding. Well, it turns out I didn't get my timing right and it's now time to put the brisket in holding, but guests won't be here and ready to eat for 5-6 hours.
Is 5-6 hours wrapped up in an insulated cooler too much? What should I do?