At 350 degree Fahrenheit, it takes approximately one hour and 15 minutes to one hour and 30 minutes to cook a whole chicken weighing 3 to 5 pounds. The correct timetable for cooking a whole chicken depends on three variables: temperature, cooking method and weight of the bird.
Increasing the oven temperature helps a whole chicken cook faster. At 425 degrees F, it takes approximately one hour and 20 minutes to cook a chicken weighing 5 to 6 pounds. Because slow cookers operate at lower temperatures, it takes longer to cook a chicken thoroughly. In a slow cooker set to high, it takes about six hours to cook a 4-pound bird. A whole chicken is safe to eat when its internal temperature reaches 180 degrees F.