I recommend cooking a 3-4 pound boneless pork butt for 8 - 10 hours on low for best results. You’ll know it’s ready when you can easily pull the meat apart with two forks. If the meat is still hard to pull apart, then it needs to cook longer.  u003cbr/u003eu003cbr/u003eIf short on time, you can set the cooking time to 5-6 hours on high heat. However, you run the risk of the meat drying out. Slow and low is my favorite way to cook pulled pork.