Sometimes I will cook the oxtails on the stove for about an hour after adding all ingredients. When the oxtails start to brown a bit I place them in the slow cooker on low for another 4 to 5 hours. But remember, my supermarket cuts them about 3” thick, that is why I need to cook them longer. I recommend you cook these around noon for dinner that way if you need to cook them longer on the stove you have the time to do so. Keep warm at 175 degrees in the oven until dinner.