Real crying usually lasts two minutes or less, but may continue for five. After that point, the child is merely complaining... I would require him to stop the protest crying, usually by offering him a little more of whatever caused the original tears.
James Dobson'Dare to Discipline' was published in 1970 in the midst of the Vietnam War and a culture of rebellion. The book was written in that context, but the principles of child rearing have not changed.
James Dobson