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I thought with that size it would take 24 hours to cook so I started it at 3 PM yesterday. It was 195 when I took it off and the probe went in like butter. I separated the point from the flat at that time so it would fit tightly in my cooler and put it there with towels to fill in the air.
My wife brought me a 17 lb packer to cook for a party this afternoon. I want to feed people at approximately 5 but my brisket was ready at 8:30 AM. I have it wrapped in foil and in a cooler like Jeff's recipes suggest but those say it should stay that way for 4 hours. Not sure if it can stay...