Translation:School finishes before noon on Saturday.
I had understood that "Lavoro sabato" means "I am working on Saturday" that is, on one occasion, and that "Lavoro il sabato" means "I work on Saturdays" that is every or frequent Saturdays. Is this correct? If so, why is the translation for this question not "before noon on Saturdays?" and the given translation "on Saturday" is incorrect.