The slate is led by AS THE WORLD TURNS, with about 7,700 episodes that aired from 1979 to 2010, and GUIDING LIGHT, with 5,400 episodes spanning 1988 to 2009.
UPDATED:
For those wondering, episodes of GUIDING LIGHT from before 1988 do exist. If you remember our 25 Biggest Blunders list, the WIPING process taped over decades of soap history but shows from the late 1970s onward are pretty much intact across the board, and that applies to GL as well which starts in 1979.