The cooking time for an 8-pound chicken can vary depending on the cooking method and the temperature used. As a general guideline, you can use the following cooking times for a whole chicken at various temperatures:
- Roasting at 350°F (175°C): Approximately 2 to 2.5 hours
- Roasting at 375°F (190°C): Approximately 1.75 to 2.25 hours
- Roasting at 400°F (200°C): Approximately 1.5 to 2 hours
- Roasting at 425°F (220°C): Approximately 1.25 to 1.75 hours
Remember that these are approximate cooking times, and it's essential to use a meat thermometer to ensure the chicken reaches a safe internal temperature of 165°F (74°C) in the thickest part of the meat. The cooking time can also be affected by the specific characteristics of your oven and the starting temperature of the chicken (if it's chilled or at room temperature). Always use a meat thermometer to check for doneness and adjust the cooking time accordingly.