For medium rare cooked pork shoulder, the meat should be held at 135°F or 57.2°C, while medium cooked meat is done at 145°F or 62.8°C. If a traditional well done shoulder is desired, it should be cooked at 155°F or 68.3°C. No matter what temperature range is used, the pork shoulder should be cooked for 1 to 2 days. For a crisp or well done outer part, sous vide pork shoulder may be finished by searing, grilling or torching. According to Modernist Cooking Made Easy (emphasis added):