Question: how long to cook a pork roast at 275 degrees?
Answer: Preheat oven to 275 degrees F.
Blend together sage, rosemary, garlic, fennel seeds, salt, and pepper in a food processor until a thick paste forms. With motor running, add wine and oil and blend until combined well. ... 
Put pork, fat side up, in a roasting pan and roast in middle of oven 6 hours.