Hi
This one is a bit of a hard one to answer
The lounge is meant to be open only 2 hrs from NZ departures but due to the lounge being also used by VA, All *A (but SQ) and Etihad
This means the lounge is now open almost all day, I think you will find that if there is a VA, NZ, *A or Etihad Departure within the next 2 hrs then the lounge is open