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.
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.