I'm an applicant from HK.
FYI, my application was submitted online in July, and received a phone call in October, notifying me the first round interview in November. As you can see, the process of application was of extremely low efficiency, and patience is required. Yet after the first interview, it took CX only 4 days to call me into the second round which was scheduled in December. The HR personnel said the second round, ICAO English assessment, takes two week of grading. So I have to spend the Christmas in deep anxiety.
As far as I know, the third round will be a busy day including group project, social lunch and technical assessment. Sounds quite scary.