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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.
Please try again later. How to cook or heat a spiral sliced ham. For a cooked ham, the time in a 350Â° oven is 10 minutes per pound of weight. For an uncooked ham, double that to 20 minutes per pound.1  Education.2  Standard YouTube License.lease try again later. How to cook or heat a spiral sliced ham. For a cooked ham, the time in a 350Â° oven is 10 minutes per pound of weight. For an uncooked ham, double that to 20 minutes per pound.