A 1.8 pound pork roast typically takes about four to six hours to cook on the high setting in a slow cooker. On the low setting, it takes about seven to eight hours.
Cook times for pork roast are approximate and depend on a variety of factors, including fat content of the meat, size of slow cooker and addition of vegetables or liquids. Consult slow cooker instructions to determine specific cooking time. For best results, use a meat thermometer throughout the cooking process to determine when meat is ready. For pork roast, 160 degrees is medium and 170 degrees is well done.