off-hour
Noun
Meaning
(US) A period when traffic is light
time outside normal business hours
Source: en.wiktionary.orgExamples
Simpson also testified that the health ministry doesn’t track how often (or rarely) inspections are done in the evening or overnight; that off-hour inspections sometimes happen, but that more of them would be better.
Told them a day in advance we’d be coming, set an off-hour where we could expect to have the place to ourselves.