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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.
If the ham is spiral-sliced, place it cut side down in a baking dish. Cover with tightly with foil. Reheat in a 325-degree oven until it reaches an internal temperature of 135 to 140 degrees. You can also place the ham in an oven bag. Figure no more than 10 minutes per pound for reheating.