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I personally don't foil I like the bark. Be ready for a long ride and maybe kick that temp up a bit 250 you need to get over 140* in 4 hours or your in the danger zone to long. You can cook even hotter but 250 is just what a lot of people do.
Personally I do foil at 165 taking the butt to 203-205 before pulling and placing into an ice chest for an hour. yes you can crank up the temps if needed.
Looks wonderful, remember, if your looking you aint cooking. I do my butts at 225 and they sometimes take a coons age but it is worth every hour. That looks like a pretty good sized butt there.
I bet 18 hours for that puppy. Maybe 20 with no foil. Hope you aren't planning on having PP for dinner tonight. could be more like a midnight snack. lol