Has anyone sous vidded a particularly tough cut of meat for 48 hours? I've seen some recipes that call for that length of time. I'm just wondering how devoting two whole days of one's life to a pot roast, for example, works out for anyone. Just keep adding water and hoping Joule doesn't stay red hot seemingly forever and not burn out? I'm thinking sous vide is probably useful and practical just for the most tender cuts of meat.