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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.
Bake on a sheet pan uncovered.3. Sliced roast should be heated for 15â20 minutes; a wholeroast should be heated for 20-30 minutes until heated through to an internal temperature of 165Â°F. Honey Mustard Spiral Cut Ham Oven 1. Preheat oven to 300Â°F.2. Place ham in roasting pan and cover with aluminum foil.3.