Alfa Track = 15-16 min, Bravo Track = 16-17 min, Charlie Track = 17-19 min.
They carry fuel for a round trip (not one leg) as no fuel is available at the HK pad, Plus 14 min of waiting in HK pax.
Their saving grace is, they mainly fly Chinese men and woman that are 50lbs lighter than a Western, so a full load of 12 is (usually) OK.
but add a raft kit and do the math someone.