You’ll have to plan plenty of hours in advance if you want to eat Slow Cooker Roast Beef, but the results will be worth the wait. The simplicity of this recipe can’t be beat, especially since it’s essentially a dump-everything-in-the-slow-cooker meal. After 8-10 hours, you’ll have an unbelievably tender cut of meat to serve alongside potatoes, rice, or veggies. Slow Cooker Roast Beef is a savory delight that you can come home to, hot and ready to eat.