It open daily 24 hours and can be access from Terminal 2 near the Emirate Lounge one floor up from the departure floor. Children under 2 yrs. are admitted free. We used our Priority pass to access this lounge when we arrived in HKG around 4am when nothing was open. When we arrived, there were some snacks, cereals, drinks, and really empty. They have a few booths that seemed to offer hot food but were not opened until 6am.