The answer to this question depends on the manner you are cooking the chicken breast. If you are planning to bake a chicken breast in 350 degrees Fahrenheit, it will take approximately 40 to 45 minutes if you are baking it with bone-in, while it will take 25 to 30 minutes if the chicken breast is de-boned. If you are cooking it in a pan, it will take approximately 15 to 20 minutes for the chicken breast to be fully cooked.
However, if you are using a crock pot or a slow cooker, it will take approximately 3 hours for it to be cooked because that is how long it will take the chicken breast to reach 165 degrees Fahrenheit.