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Typically this is about 18 minutes per pound but Iâll sometimes pull mine out about 20 minutes before that since it will stay warm in the tinfoil (and even room temperature ham is MUCH better than dry)! Most directions for cooking a spiral sliced ham tell you to reheat your ham at 275F and I agree with this method.
Place a tight-fitting lid on top of the pan or dish, or cover with foil. Place the ham in the oven and heat for roughly 12 to 15 minutes per pound. A half spiral ham should take about two hours and a whole ham about three hours. Remove the ham from the oven at the end of the cooking time, slice it up and serve. Remove the ham from the oven about 30 minutes before the end of the cooking time if you want to add a glaze.