Question: how long does it take to cook a thawed turkey breast?
Answer: Preheat the oven to 400° F. ... 
Place the turkey breast in a roasting pan or a rimmed baking sheet. ... 
Roast the turkey for 30 minutes for boneless breasts or 45 minutes for bone-in breasts or until an instant-read thermometer inserted into the center of the breast reaches 150-155°F.