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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.
Best Answer: the spiral hams are cooked and because they are cut they dry out easily. Place the ham in your slow cooker if you have one. Add a bit of liquid, ginger ale is good and place the ham cut side down. Heat it on low for about 1 hour then turn it over and continue to heat.eport Abuse. A spiral ham is already cooked, so you would just need to heat it and apply the glaze. Read the instructions on the ham packaging. A rule of thumb is about 10-15 minutes per pound.