Cooking Time for a Stuffed Turkey You've selected ... For 12- to 14-pound turkey, roast 3½ to 4 hours. For 14- to 18-pound turkey, roast 4 to 4¼ hours. For 18- to 20-pound turkey, roast 4¼ ...
These cooking ... your turkey after stuffing it. -Preheat the oven to 180C/160C Fan/Gas 4. -For a turkey that weighs less than 4.5kg/ 9lb 15oz: roast for 45 mins/kg or 18 mins/lb plus 20 minutes.