The program, which featured host commentary with a mix of listener call-in and guest segments, was broadcast live every weekday from the Fox News Channel studios in New York City from 12:00 p.m. to 2:00 p.m. (total runtime approximately 120 minutes, less 34 for commercials) and was distributed by Westwood One in conjunction with Fox News Radio.
[citation needed] Bill O'Reilly was the host of the program from Monday through Thursday and was joined by co-host Lis Wiehl two days in the week.
On Fridays, the show was usually hosted by a guest host; the most recent rotation included Michael Smerconish, Dom Giordano (Both from CBS Radio's Philadelphia Station, WPHT-AM) and Doug McIntyre (Tony Snow also was a regular substitute for this show until his 2008 death).
[citation needed] The show launched on May 8, 2002 on 205 stations, in 19 of the top 20 markets across the country; as of the end of 2008, his affiliate count was over 400.
[1] According to the September 2007 issue of Talkers Magazine, in terms of audience The Radio Factor was in the top twelve of nationally aired talk shows.