There is no specific time frame for cooking chicken in the slow cooker. It all depends on how thick the chicken is, what temperature it is cooked on, and if there is anything else cooked with it. But generally 6-8 hours on low and 3-5 on high heat. However, if you want some detailed instruction on how long to cook your chicken Thriving Home gives some great information on how long to cook chicken in the slow cooker. It has great tips for cooking in the slow cooker.