How long does it take to cook vegetables with soy sauce?

Never cook soy sauce for more than half an hour. Soy sauce is generally used in stews in hotel kitchens. For example, put soy sauce in braised pork half an hour in advance. In the process of cooking, after high temperature and water evaporation, the dishes will become dark and tight. The correct operation process is to cook braised pork until it is 90% ripe, use a small amount of sugar, and then use soy sauce to enhance the color.