The NTSB seems to agree with you...
http://www.aviationweek.com/Article.aspx?id=/article-xml/awx_01_29_2013_p0-542382.xml
But the FAA and TWU are ok with it.
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The NTSB seems to agree with you...
http://www.aviationweek.com/Article.aspx?id=/article-xml/awx_01_29_2013_p0-542382.xml
Just taking a poll whether you would consider working a 13 hour shift to have four days off.