Você estava perto. Fim de semana de quatro dias ( ISFDB ) por George H. Smith.
Encontrado pesquisando no ISFDB para títulos com "fim de semana" e procurando por livros dos anos 60.
A sinopse é transcrita em esta revisão :
It was impossible, of course, because the machines had been ruling everything for 100 years, so what could they revolt against?
They decided people had outlived their usefulness to them, and that genocide of 4 billion people on Planet Earth was the best policy.
And into this incredible situation Charles Henry Hyde was thrust, with a shrew of a wife named Agnes who nagged like it was 1966...