Cover and transfer to the oven: Once simmering, cover the Dutch oven and transfer the whole pot to the oven. Cook for 2 to 4 hours, until fork tender: Let the pork cook undisturbed for 2 hours, then begin checking it every half hour.Total cooking time will be 2 to 4 hours, depending on the amount of pork and whether it's bone-in (which takes longer to cook).over and transfer to the oven: Once simmering, cover the Dutch oven and transfer the whole pot to the oven. Cook for 2 to 4 hours, until fork tender: Let the pork cook undisturbed for 2 hours, then begin checking it every half hour.