Chicken usually takes 20-30 minutes in the oven at 450F, depending on the size of the chicken pieces. You don’t want your kabobs burnt or dried out so keep an eye on them while baking. Baking them for 30 minutes is usually enough. Don’t forget to flip them over after 15 minutes so that all sides are cooked. After 30 minutes, check them to see if all parts are cooked. Cook for another 5 minutes if needed.