How long do you cook a 3 d roast in crockpot?

To cook a 3-pound roast in a crockpot, you should plan for about 8 to 10 hours on low heat or 4 to 6 hours on high heat. The cooking time may vary depending on the specific cut of meat and your crockpot's efficiency, so it's a good idea to check for tenderness and doneness. Using a meat thermometer can help ensure it reaches the appropriate internal temperature of at least 145°F.