From what I understand, the cooking process melts the collagen, turning it into gelatin and making the meat more tender. However, the process also tends to cook the meat itself, making it tougher. So too long or too high and the stewing beef is too tough.
How long is too long? Say in a slow cooker on high, where is the inflection point where the meat stops getting more tender and start to get tougher? I googled the crap out of this but haven't found an answer?