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You should be able to generally use the same time as you normally would. A 15 lb. turkey would take approximately 3 hours if it is unstuffed. But the best way to achieve proper doneness is to check the turkey with a thermometer. The breast should be 170 degrees F. and the thigh should be 180 degrees F. Cooking times will vary according to conditions. If you go to the following addresses on this site you will see further information: http://www.recipetips.com/kitchen-tips/t--910/turkey-cooking-times.asp or http://www.recipetips.com/kitchen-tips/t--412/roasting-turkey.asp . Both of these articles will give you all the information you need to cook it to the proper doneness and end up with a moist and delicious turkey.