24 hours per day, seven days per week. Designates a round-the-clock service, typically including holidays, as might be offered by a supermarket, ATM, gas station, concierge service or manned data center.
(colloquial, often figurative) Constantly, with little or no interruption; continually; very often.
Esimerkit
They're open twenty-four seven; you can go there any time you want.
My girlfriend's jealous 'cause I talk about you twenty-four seven