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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.
Preheat the oven to 350Â° F (180Â° C/Gas 4). Place the ham on a rack in a baking pan and add about 1/4 inch of water to the pan. If the ham is labeled 'fully cooked' (does not require heating), heat for 8 to 10 minutes per pound, or to an internal temperature of 140Â°F. To heat a spiral-sliced ham, place it on a sheet of heavy-duty foil, cut-side down.