The answer to how long to cook a stuffed turkey depends on the weight of the bird and whether it's stuffed. For roast stuffed turkey, it's approximately 20 minutes per pound of turkey. This is an excellent opportunity to practice math skills with kids. Have them locate the weight on the tag, round if needed to the nearest whole number, and then multiply by 20 to find the number of minutes to cook the turkey. From there they can divide by 60 (the number of minutes in an hour) to get the number of hours (with the remainder being the number of minutes) to cook the turkey. Take the lesson further by having them calculate the time the turkey should be done, and then set an alarm for a suitable time to check it, and times for basting. The turkey is done when the internal temp is 165°F.