You should be able to expect your Cuban black beans to be cooked in about 6 to 7 hours when cooked on the LOW setting. I do not recommend trying to cook the beans quicker on the HIGH setting as the beans really do best when allowed to absorb the liquid when cooked at a lower heat for a longer period of time.u003cbr/u003eu003cbr/u003eIf your beans have been lingering in the back of your pantry for several years you may find that they take a little bit longer to cook and may also need additional water because your beans may be really dry. If your beans are not cooked in 7 hours, go ahead and add a cup or two of hot water (hot water so that you do not drop the temperature of your slow cooker down too much) and let your beans cook for an hour or two longer.