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uptime 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 downtime.
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 period of time when something (as a machine or factory) is functioning and available for use
Synonyms, antonyms and the broader and narrower relations for uptime come from Princeton University’s WordNet. Full sources and licences.