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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 reheating is desired, heat to 140 Â°F (165 Â°F for leftover spiral-cut hams or ham that has been repackaged in any other location outside the plant). To reheat a spiral-sliced ham in a conventional oven, cover the entire ham or portion with heavy aluminum foil and heat at 325 Â°F for about 10 minutes per pound.