(also 24 / 7 ) adverb
( informal ) twenty-four hours a day, seven days a week (used to mean 'all the time') :
He's on duty twenty-four seven.
(also 24 / 7 ) adverb
( informal ) twenty-four hours a day, seven days a week (used to mean 'all the time') :
He's on duty twenty-four seven.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005