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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.
Put the ham, flat-side down, on a rack in a roasting pan. Pour 1/4 inch water into the bottom of the pan. Transfer to the oven and roast until a thermometer inserted into the thickest part of the ham registers 130 degrees F, about 2 hours, 30 minutes (about 15 minutes per pound).Increase the oven temperature to 425 degrees F. Pour half of the glaze (see below for glazes) over the ham and brush to coat.ransfer to the oven and roast until a thermometer inserted into the thickest part of the ham registers 130 degrees F, about 2 hours, 30 minutes (about 15 minutes per pound).