Question: how long do you cook fully cooked turkey legs?
Answer: Preheat the oven to 350 degrees F (175 degrees C). ... 
Stand the turkey legs upright (as if the turkey were standing). ... 
Roast uncovered for 1 1/2 to 2 hours, until the legs are golden brown and the internal temperature is 180 degrees F (82 degrees C) when taken with a meat thermometer.