<P> Although the show's ratings have been high, the network usually keeps the show's run limited to before the official start of the next television season in the third week of September with some reductions or expansions depending on Olympic years, where finale ratings are usually lower due to returning programming on other networks . </P> <P> The highest rated season in overall viewers to date is season four (2009). The most - watched episode has been the finale of season five (2010), with 16.41 million viewers . The series premiere and an episode featuring the first part of Las Vegas Week in season six (2011) have each tied for highest rating among adults 18--49, both having a 4.6 rating . </P> <Table> <Tr> <Th> Season </Th> <Th_colspan="2"> Premiered </Th> <Th_colspan="2"> Ended </Th> <Th> TV season </Th> <Th> Timeslot (ET) </Th> <Th> Season viewers </Th> <Th> Season ranking </Th> </Tr> <Tr> <Th> Date </Th> <Th> Viewers (in millions) </Th> <Th> Date </Th> <Th> Viewers (in millions) </Th> </Tr> <Tr> <Th> </Th> <Td> June 21, 2006 </Td> <Td> 12.41 </Td> <Td> Final Performances: August 16, 2006 </Td> <Td> </Td> <Td> 2005--06 </Td> <Td> Wednesday 8: 00 pm </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Season Finale: August 17, 2006 </Td> <Td> 12.05 </Td> <Td> Thursday 9: 00 pm </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> </Th> <Td> June 5, 2007 </Td> <Td> 12.93 </Td> <Td> Final Performances: August 20, 2007 </Td> <Td> </Td> <Td> 2006--07 </Td> <Td> Tuesday 8: 00 pm </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Season Finale: August 21, 2007 </Td> <Td> 13.87 </Td> </Tr> <Tr> <Th> </Th> <Td> June 17, 2008 </Td> <Td> 12.80 </Td> <Td> Final Performances: September 30, 2008 </Td> <Td> 10.23 </Td> <Td> 2007--08 </Td> <Td> Tuesday 9: 00 pm (June 17--August 5) Tuesday 8: 00 pm (after August 26) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Season Finale: October 1, 2008 </Td> <Td> 12.55 </Td> <Td> Wednesday 9: 00 pm (after August 27) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> </Th> <Td> June 23, 2009 </Td> <Td> 11.30 </Td> <Td> Final Performances: September 15, 2009 </Td> <Td> 13.84 </Td> <Td> 2008--09 </Td> <Td> Tuesday 9: 00 pm </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Season Finale: September 16, 2009 </Td> <Td> 15.53 </Td> <Td> Wednesday 9: 00 pm </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 5 </Th> <Td> June 1, 2010 </Td> <Td> 12.35 </Td> <Td> Final Performances: September 14, 2010 </Td> <Td> 14.60 </Td> <Td> 2009--10 </Td> <Td> Tuesday 9: 00 pm </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Season Finale: September 15, 2010 </Td> <Td> 16.41 </Td> <Td> Wednesday 9: 00 pm </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> 6 </Th> <Td> May 31, 2011 </Td> <Td> 15.28 </Td> <Td> Final Performances: September 13, 2011 </Td> <Td> 13.67 </Td> <Td> 2010--11 </Td> <Td> Tuesday 8: 00 pm (May 31--July 5) Tuesday 9: 00 pm (after July 5) </Td> <Td> 12.65 </Td> <Td> </Td> </Tr> <Tr> <Td> Season Finale: September 14, 2011 </Td> <Td> 14.37 </Td> <Td> Wednesday 9: 00 pm (after June 22) </Td> <Td> 11.49 </Td> <Td> </Td> </Tr> <Tr> <Th> 7 </Th> <Td> May 14, 2012 </Td> <Td> 10.48 </Td> <Td> Final Performances: September 12, 2012 </Td> <Td> 11.05 </Td> <Td> 2011 - 12 </Td> <Td> Monday 8: 00 pm (May 14--July 3) Tuesday 8: 00 pm (after July 3) </Td> <Td> 10.48 </Td> <Td> </Td> </Tr> <Tr> <Td> Season Finale: September 13, 2012 </Td> <Td> 10.59 </Td> <Td> Tuesday 9: 00 pm (May 14--July 3) Wednesday 9: 00 pm (after July 3) </Td> <Td> 10.58 </Td> <Td> </Td> </Tr> <Tr> <Th> 8 </Th> <Td> June 4, 2013 </Td> <Td> 12.41 </Td> <Td> Final Performances: September 17, 2013 </Td> <Td> 11.19 </Td> <Td> 2012--13 </Td> <Td> Tuesday 8: 00 pm </Td> <Td> 11.22 </Td> <Td> </Td> </Tr> <Tr> <Td> Season Finale: September 18, 2013 </Td> <Td> 11.49 </Td> <Td> Wednesday 8: 00 pm (after July 10) </Td> <Td> 10.34 </Td> <Td> </Td> </Tr> <Tr> <Th> 9 </Th> <Td> May 27, 2014 </Td> <Td> 12.00 </Td> <Td> Final Performances: September 16, 2014 </Td> <Td> 11.46 </Td> <Td> 2013--14 </Td> <Td> Tuesday 8: 00 pm (May 27--July 15) Tuesday 9: 00 pm (after July 22) </Td> <Td> 10.31 </Td> <Td> </Td> </Tr> <Tr> <Td> Season Finale: September 17, 2014 </Td> <Td> 12.21 </Td> <Td> Wednesday 9: 00 pm (after July 23) </Td> <Td> 10.37 </Td> <Td> </Td> </Tr> <Tr> <Th> 10 </Th> <Td> May 26, 2015 </Td> <Td> 11.09 </Td> <Td> Final Performances: September 15, 2015 </Td> <Td> 11.33 </Td> <Td> 2014--15 </Td> <Td> Tuesday 8: 00 pm </Td> <Td> 10.70 </Td> <Td> </Td> </Tr> <Tr> <Td> Season Finale: September 16, 2015 </Td> <Td> 9.54 </Td> <Td> Wednesday 8: 00 pm (after August 12) </Td> <Td> 9.07 </Td> <Td> </Td> </Tr> <Tr> <Th> 11 </Th> <Td> May 31, 2016 </Td> <Td> 11.67 </Td> <Td> Final Performances: September 13, 2016 </Td> <Td> 13.97 </Td> <Td> 2015--16 </Td> <Td> Tuesday 8: 00 pm </Td> <Td> 11.71 </Td> <Td> </Td> </Tr> <Tr> <Td> Season Finale: September 14, 2016 </Td> <Td> 14.41 </Td> <Td> Wednesday 8: 00 pm (after July 5) </Td> <Td> 10.97 </Td> <Td> </Td> </Tr> <Tr> <Th> 12 </Th> <Td> May 30, 2017 </Td> <Td> 12.37 </Td> <Td> Final Performances: September 19, 2017 </Td> <Td> 14.70 </Td> <Td> 2016--17 </Td> <Td> Tuesday 8: 00 pm </Td> <Td> 12.90 </Td> <Td> </Td> </Tr> <Tr> <Td> Season Finale: September 20, 2017 </Td> <Td> 15.64 </Td> <Td> Wednesday 8: 00 pm (after August 9) </Td> <Td> 12.00 </Td> <Td> </Td> </Tr> <Tr> <Th> 13 </Th> <Td> May 29, 2018 </Td> <Td> 12.16 </Td> <Td> Final Performances: September 18, 2018 </Td> <Td> TBA </Td> <Td> 2017--18 </Td> <Td> Tuesday 8: 00 pm </Td> <Td> TBA </Td> <Td> TBA </Td> </Tr> <Tr> <Td> Season Finale: September 19, 2018 </Td> <Td> TBA </Td> <Td> Wednesday 8: 00 pm (after August 15) </Td> <Td> TBA </Td> <Td> TBA </Td> </Tr> </Table> <Tr> <Th> Season </Th> <Th_colspan="2"> Premiered </Th> <Th_colspan="2"> Ended </Th> <Th> TV season </Th> <Th> Timeslot (ET) </Th> <Th> Season viewers </Th> <Th> Season ranking </Th> </Tr>

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