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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 the ham in a baking pan and cook for approximately 20 to 25 minutes per pound, or follow the directions on the package for cooking times. A fully cooked ham will be done when the internal temperature reaches 130 degrees F to 140 degrees F.