While RH refused to expand, AMC was up for the task and expanded to 60 minutes in April 1977. They rotated positions with RH and returned to their prior launch timeslot. AMC cut off CBS's ATWT and NBC's DAYS. ABC's aggressive tactic paid off, as their lineup picked up momentum and AMC pushed past DAYS. And AW spinoff Somerset ended after nearly 7 years and revamped as Friends and Lovers.
ABC's scheduling needed an overhaul as their entries rested in the middle to bottom of the pack. OLTL and GH taking an extra 15 minutes did not dent competition from AW and GL, but both pushed past NBC's ailing Doctors. CBS continued to rule the roost, but 1977 damaged their franchises, as NBC experienced this endemic as well.
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Source -- https://en.wikipedia.org/wiki/List_of_U.S._daytime_soap_opera_ratings