| Seasons | Episodes | Originally aired | DVD release date | Nielsen ratings | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Season premiere | Season finale | Region 1 | Region 2 | Region 4 | U.S. viewers (millions) |
Rank | 18–49 rating/share (rank) |
|||
| 1 | 17 | September 24, 2007 (2007-09-24) | May 19, 2008 (2008-05-19) | September 2, 2008 | January 12, 2009 | April 3, 2009 | 8.31 | 68 | 3.3/9 (TBA) | |
| 2 | 23 | September 22, 2008 (2008-09-22) | May 11, 2009 (2009-05-11) | September 15, 2009 | October 19, 2009 | March 3, 2010 | 10.00 | 44 | 3.8/10 (TBA) | |
| 3 | 23 | September 21, 2009 (2009-09-21) | May 24, 2010 (2010-05-24) | September 14, 2010 | September 27, 2010 | October 13, 2010 | 14.12 | 12 | 5.3/13 (5) | |
| 4 | 24 | September 23, 2010 (2010-09-23) | May 19, 2011 (2011-05-19) | September 13, 2011 | September 26, 2011 | October 5, 2011 | 13.14 | 13 | 4.4/13 (7) | |
| 5 | 24 | September 22, 2011 (2011-09-22) | May 10, 2012 (2012-05-10) | September 11, 2012 | September 3, 2012 | October 3, 2012 | 15.82 | 8 | 5.5/16 (5) | |
| 6 | 24 | September 27, 2012 (2012-09-27) | May 16, 2013 (2013-05-16) | September 10, 2013 | September 2, 2013 | 18.68 | 3 | 6.2/19 (2) | ||
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