Expansion fever continued to sweep CBS and ABC as Guiding Light eyeballed an hour-long expansion late in 1977. This expansion threatened ABC's OLTL and GH with the very overlap they used to crush NBC's The Doctors. Eyeing ruin, ABC decided to go for broke and expanded both soaps to 60 minutes, crossing over GL. GH was in threat of cancellation and had six months to shape up or ship out. The strategy worked as GH finally broke its 70's drought.
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Source -- https://en.wikipedia.org/wiki/List_of_U.S._daytime_soap_opera_ratings