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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.
Spiral hams should not be cooked uncovered. Ham baking time varies by the weight of the meat. Most hams should be baked for about 10 minutes per pound. Your ham is done when the center slices are quite warm to the touch, or measure about 90 degrees on a meat thermometer, and the inside of the ham is steaming. The first slice or two may look dry, but others should be moist.