Line a baking sheet with foil and place a raised roasting rack on the foil. Place the duck on top and transfer to the oven, breast-side up, for 1 hour.
Flip the duck and roast, breast-side down, for 1 more hour.
Remove the duck from the oven. At this point, you can drain off the duck fat and reserve it for another use.
Roast the duck, breast-side up for 20 minutes more.