Your cooking times will vary depending on the size of your chicken. My chicken was 5 pounds and took about 80 minutes to reach 165ºF. Also, keep in mind that different ovens will vary in their exact temperatures which also changes your cooking time. The best way to know for sure if you chicken is done is to test with a meat thermometer. You want the internal temperature to reach 165ºF when the thermometer is inserted into the inner thigh without touching the bone. The juices should also run clear.