Because we're using an already cooked ham, the purpose of this recipe is to warm it up while adding delicious flavor with the glaze and tenderizing it with pineapple juice. I typically cook mine in the crockpot on low for 4 to 5 hours, until it's warm, tender, and juicy. Make sure to baste twice during the last hour of cooking. I recommend using a bone-in spiral-cut ham that's about 7-10 pounds.