The length of time that is required for cooking chicken depends on the size of the chicken and the type of the chicken that you are using. In actuality, the cook time of chicken may also depend on the recipe itself. For example, a roasted chicken may take an hour or two to roast if you are making a whole chicken. If you are simply roasting a few boneless, skinless chicken breasts, it only takes about half an hour. If you are cooking chicken in a pan, the cook time is greatly dependent upon the size of the chicken.