How long does it take to cook a fully cooked 10lb. ham in crockpot?

You don't cook a fully cooked ham in a crockpot/slow cooker. A fully cooked ham is ready to eat. If you want to warm it up, place the ham in a shallow roasting pan and cover with foil. Bake at 325 degrees Fahrenheit for about 10-15 minutes per pound or until heated through.