It seems, however, well established that longer hours do not necessarily mean increased output.
There is a limit to the time during which a man can do even routine work effectively.

If men were to be regarded only as machines for turning out work of a certain class, very long hours would be bad business.

Where the work involves special skill and thought the evil results of long hours, even measured simply by the gross amount done, are still more serious.

Everyone who has had to do with young students and still more with parents disappointed by their sons' failures must again and again have found that the cause of failure was too many hours devoted to reading.

The students acquired the habit of sitting over their books worrying their minds, but really absorbing nothing.