The general guideline for baking a fully cooked bone-in ham is to cook it at 325°F for about 10 to 20 minutes per pound, depending on the recipe and ham size. Here are some detailed recommendations:

• A simple baked ham recipe suggests cooking the ham for 10 minutes per pound at 325°F, covered with foil and water in the pan to keep it moist. During the last 30 minutes, increase the oven temperature to 425°F, remove the foil, and brush with glaze twice to caramelize the surface. Let the ham rest for 20 minutes before carving

• Another source recommends cooking a whole bone-in ham weighing 10 to 14 pounds at 325°F for 18 to 20 minutes per pound until the internal temperature reaches 145°F

• For a 9-pound bone-in ham, cooking for about 12 to 14 minutes per pound at 325°F is suggested, with glazing added in the last 15 minutes of cooking. Rest the ham 15 minutes before carving

• A recipe from The Pioneer Woman for a 15- to 18-pound fully cooked bone-in ham suggests baking at 325°F for 2 to 2.5 hours covered with foil, then glazing every 20 minutes uncovered for about 40 minutes. Rest 15 to 20 minutes before carving

Summary:

• Preheat oven to 325°F.
• Bake ham covered for about 10 to 20 minutes per pound (most commonly around 12-14 minutes per pound).
• During the last 30 to 40 minutes, remove foil, increase heat to 425°F, and apply glaze to caramelize.
• Let ham rest 15 to 20 minutes before carving.

This method yields a moist, tender ham with a nicely caramelized glaze