There should be no legally mandated ceiling on weekly working hours as it limits economic growth.  The transaction, hiring and human resource costs of forcing businesses to take on more workers mean that productivity is reduced and resources are wasted. While GDP might rise because of these actions, GDP will rise due to a fallacy of the "labour theory of value"1 kind. Effort isn't in and of itself productive, though it will add to many measures of GDP. Currently displaced workers would be better served inventing new products and services for the economy they are in.  1 Mick Brooks "An Introduction to The Labour Theory Of Value Part One" Marxist.com 15th Oct 2002