Definition of keep late or regular hours in English:

keep late (or regular) hours

Get up and go to bed late (or at the same time) every day: she’d been under the impression that natives of Spanish-speaking countries kept late hours
More example sentences
  • Dependent on the passing trade, Istanbul is open seven days a week and keeps late hours.
  • Mind you, I've not yet seen him - he seems to keep late hours, but has apparently been preparing for a conference in Cyprus that he is now away upon.
  • It appears that my unidentified contact keeps late hours.
See parent entry: hour

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Word of the day anastrophe
Pronunciation: əˈnastrəfi
noun
the inversion of the usual order of words...