A stuffed turkey will take approximately 30 minutes per pound. In addition to a 180 degree temperature at the turkey thigh, the stuffing temperature should reach 165 degrees at the center. If a meat thermometer is not available, stuffing a turkey is not recommended. If not using a meat thermometer, turkey should be cooked until the juices run clear with no trace of pink. A truly accurate measure of doneness can only be determined by use of an accurate cooking thermometer.
Many variables can affect roasting time.
A partially frozen turkey requires longer cooking, shiny pans cook slower than dark pans, use of a foil tent for the entire cooking time can slow cooking, use of a lid or cooking bag can speed up cooking.