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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.
Your 325 degree oven will cook the ham in 22 to 26 minutes per pound. You're looking at about 3 hours (ball park), and if you don't have a thermometer that you can stick in meâ¦at to measure inside temperature, it might be wise to invest in one.