These days, the cooking times on most boxes of dried pasta are in the ballpark, but there are exceptions. Boxed macaroni and cheese and other “children’s” pasta products routinely have cooking times that should be cut in half. But even in the best case, cooking times are just estimates. The actual cooking time will depend on the temperature and humidity of your kitchen, the mass and thermal conductivity of your cookware, the power of your cooktop, and on and on.