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Pork loins can also vary in size and thickness. So cooking times will vary greatly, particularly if you bought the tenderloin, which cooks much faster. Cook the loin roast or pork tenderloin longer if it's large or thick. If you are unsure on how long to cook your particular roast, cook the pork loin until it reaches an internal temperature of 145°F in its thickest part. The higher the temperature, the drier the loin will be, so don't go past 145°F too much if possible.
Preheat oven to 350°F.
Cover the pork tenderloin with foil and roast for 30 minutes. Remove foil, spoon some more sauce over the loin and cook for about another 30 minutes or until the loin interior temperature reaches about 145°F.