Fri. 8pm-1am (1980-1984)
Sat. 1am-6am (1985-1989)
Sat. 6am-11am (1990-1994)
Sat. 11am-4pm (1995-2000)
Sat. 4pm-9pm (2001-2005)

C-SPAN marked 25 years of viewer calls with a live, 25-Hour Call-In Marathon on Friday, October 7, 2005, starting at 8 p.m. ET. The program looks back at key events, include guest interviews and features viewer calls.

C-SPAN launched television's first-ever, regularly scheduled, national viewer call-in program on October 7, 1980, from the National Press Club in Washington, D.C.

The 25 Winners! Grand Prize Winner: Erika Barger, Ormond Beach, FL Christina Carlson, Lihue, HI Stephanie Clemens, State College, PA Andrew Emerson, Dallas, TX Robert Ewoldt, Chicago, IL Scott Gray, Birmingham, AL Judy Hammond, Alachua, FL Kathleen Holowach, El Cajon, CA Barrett Kalellis, Pinckney, MI Anthony Lee, Berkeley, CA Ron LueDecke, Palms, CA Maria Lyda, Tulsa, OK Joe Martin, Oceanside, CA Mary McGinnis, Rupert, ID Robert Meehan, Houston, TX Cesar Muedas, Brentwood, TN Andrew Ohmer, Indianapolis, IN Kathleen O'Donnell, Keene, NH Dain Pascocello, Hopewell Junction, NY Krystal Reyes, Moline, IL Carolyn Ross, Oxford, MS Diane Schockey, Gaylord, MI Joel Lawrence Steinberg, Fairfax Station, VA Carole Troll, Woodhaven, NY Patrick Turner, Hermosa Beach, CA

Over 25 years, the network has aired more than a half-million calls, booked 12,000 individual guests and produced more than 46,000 call-in segments. The first-ever caller hailed from Yankton, SD.

To commemorate the anniversary, C-SPAN conducted an essay contest, asking viewers why they watch or participate in the network's call-in programs. The grand prize winner, 17 year old Erika Barger of Ormond Beach, FL, will co-host a segment of the 25-Hour Call-In Marathon from C-SPAN's studios in Washington, D.C. An additional 24 winners will also participate in the program.