If you put it in a standard preheated coleman/igloo cooler with towels and newspaper taking up the rest of the air space it will be able to stay hot for 6+ hours.
During my house warming party I had 2 pork butts in a cooler that were in a cooler waiting for the initial 2 pork butts to be finished. I kept them from 2pm-10pm. When I took them out of the cooler and pulled them, they were still nice and hot and were easy to pull.
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