The cooking time for chicken in an oven depends on the cut and the type and size of the chicken pieces, for ex:
Whole chicken takes from 1 hour to 1 hour 30 minutes at 375°F (190°C), boneless, skinless chicken thighs takes about 25-30 minutes at 375°F.Boneless, skinless chicken breasts lasts 20-25 minutes at 375°F.