All Available Season All Season Season 1 Sep, 2007 22 episodes 7.1 Season 2 Jan, 2010 13 episodes 7.0 Season 3 Jan, 2011 14 episodes 7.1 Season 4 Sep, 2011 17 episodes 6.8 Season 5 Oct, 2012 16 episodes 6.9 Season 6 Apr, 2014 10 episodes 7.0
