Flying CX879 on Friday and been trying to track the trend of when these flights arrive in HKG. Trying to gage how often they have to stop for additional fuel. Why does FlightAware rarely have the landing time? They indicate anything from total flight time of 5 hours to 23 hours to NA???

http://flightaware.com/live/flight/CPA879/history

Anybody have any ideas on how often the flight has to re-route for fuel? where does it typically stop?

Thanks!