The cooking time for a 3-pound roast in a slow cooker can vary depending on the type of meat, the recipe, and the slow cooker's settings. However, as a general guideline, you can use the following time ranges for different types of meat:
Beef Roast (Chuck, Round, etc.): Cook on low heat for about 8 to 10 hours or on high heat for about 4 to 6 hours.
Pork Roast (Shoulder, Butt, etc.): Cook on low heat for about 8 to 10 hours or on high heat for about 4 to 6 hours.
Lamb Roast: Cook on low heat for about 8 to 10 hours or on high heat for about 4 to 6 hours.
It's essential to note that slow cookers can vary in temperature and performance, so the cooking times may differ slightly. Additionally, factors like the thickness of the roast, the slow cooker's age, and the desired level of tenderness can influence the cooking time.
To ensure the roast is cooked thoroughly and to your desired level of doneness, it's best to use a meat thermometer. Insert the thermometer into the thickest part of the roast, avoiding contact with bone or fat. For beef and lamb, a safe internal temperature is around 145°F (63°C) for medium-rare and up to 170°F (77°C) for well-done. For pork, a safe internal temperature is around 145°F (63°C) for medium and up to 160°F (71°C) for well-done.
Keep in mind that slow cooking is a forgiving method, so you have some leeway with the cooking time. If the roast reaches your desired level of tenderness before the estimated time, you can switch the slow cooker to "warm" mode until you are ready to serve.