How long do you heat cooked 9 lbs?

To reheat a cooked 9-pound dish, such as a roast or casserole, preheat your oven to 325°F (163°C). Heat it for about 1.5 to 2 hours, or until the internal temperature reaches 165°F (74°C). Use a food thermometer to ensure it’s heated thoroughly and evenly. Cover the dish with foil to prevent it from drying out during the reheating process.