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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.
2 1/2 hours. Here's how: Preheat the oven to 325, place the ham on a rack in a baking dish with a little water in the bottom.Wrap in foil, bake for about 2 hours, or until th â¦ e internal temperature is 135 - 140 degrees.Take off the foil, glaze the ham, if you like, increase the oven temp to 400 and bake for another 20 minutes or so, until the glaze is set.+ 38 others found this useful. John Gonzales.rap in foil, bake for about 2 hours, or until th â¦ e internal temperature is 135 - 140 degrees. Take off the foil, glaze the ham, if you like, increase the oven temp to 400 and bake for another 20 minutes or so, until the glaze is set. + 38 others found this useful. John Gonzales.