Deep frying chicken thighs typically takes about 12 to 18 minutes at an oil temperature of around 325°F to 350°F. The chicken should be cooked until the coating is golden brown and the internal temperature reaches at least 165°F for safety. Some methods suggest frying on each side for 12-15 minutes or a total of 25-30 minutes for bone-in thighs, depending on size and temperature. For best results, using a meat thermometer is recommended to ensure the chicken is cooked through without burning the crust.