>>http://www.wral.com/business/story/4145407/
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>Protesting against a 60 hour week. Is there a statutory limit in the US on the working week ?

The typical work week is 40 hours and if you are not salaried, you get paid overtime pay for anything over 40 hours. Usually time and half. However, salaried employess don't get overtime and many factories work their employees more hours depending on the orders they have to fill. There is a union at that factory and the union typically bargains for 40 hour work weeks and overtime and paid holidays, etc. Some factories even shut down and routinely 'lay off' their employees during slow periods. Unions bargain for pay during that time period as well. The overtime pay is covered under the Fair Labor STandards Act:

http://www.dol.gov/dol/topic/workhours/overtime.htm

Some states have laws that add to that law.