time off has no recorded synonym. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is work time.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a time period when you are not required to work
“he requested time off to attend his grandmother's funeral”
Synonyms, antonyms and the broader and narrower relations for time off come from Princeton University’s WordNet. Full sources and licences.