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For a 3- to 4-pound corned beef brisket, plan to cook it in a slow cooker for 10 to 12 hours on the low heat setting or 5 to 6 hours on the high heat setting. Get instructions on how to cook corned beef. Find the Perfect Slow Cooker Recipe!
Step 4. Cook the brisket, well covered with foil, until it's tender enough that you can easily slide the tines of a fork into the meat and twist off a mouthful. Depending on the size and thickness of your piece of brisket, that might take as little as 3 to 4 hours, or as long as 8 hours.