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That sounds a bit low. I roast mine at 350 deg. and it takes about 45 min. per pound to cook. What's important is the final temp. inside the roast. You need to get an oven thermometer that you can stick into the roast and check to see if it reads at least 170 deg. If not keep cooking. The lower temp. you cook at means it will take longer to reach 170 deg. inside.

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15y ago
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Q: How long do you cook an 8 lb pork roast on 275 degrees?
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