What stock takes the longest to cook properly?

The stock that typically takes the longest to cook properly is beef stock, especially when made from roasted bones. It is usually simmered for 12 to 24 hours to extract maximum flavor and nutrients. The prolonged cooking time allows for the breakdown of collagen and the development of a rich, deep flavor profile. In contrast, chicken stock can be made in about 4 to 6 hours, while vegetable stock takes even less time.