Season	Network	Time slot	Season premiere	Season finale	Episode count	TV season	Season rank	Viewers (in millions)
1	NBC	Monday 10:00 pm	January 3, 2005	May 23, 2005	16	2004–2005	#19	13.9[7]
2			September 19, 2005	May 22, 2006	22	2005–2006	#31	11.2[8]
3		Wednesday 10:00 pm	November 15, 2006	May 16, 2007	22	2006–2007	#51	8.3[11]
4		Monday 10:00 pm	January 7, 2008	May 12, 2008	16	2007–2008	#41	10.47[34]
5			February 2, 2009	June 1, 2009	19	2008–2009	#61	8.45[35]
6	CBS	Friday 9:00 pm	September 25, 2009	May 21, 2010	22	2009–2010	#53	7.79[36]
7		Friday 8:00 pm	September 24, 2010	January 21, 2011	13	2010–2011	#57	7.8[37]