For initial test and 1st interview, you can expect pretty flexible scheduling since CX has enough applicants to do them a few times a week.
For 2nd interview, you would need 4 people, including yourself, who passed the first interview, for the group exercises.
The hard part to organize is the 3rd interview. There are usually between 6 to 12 applicants for that day, which all of them had to have passed the 2nd interview. There is less than 5% of the total applicants who make it to the 3rd interview, and getting all these people together on the same date is hard.
The good news is if you passed the 3rd interview, you could defer the flight grading until a time which is most convenient for you. There will be at least 4 batches, possibly 6, for next year, and you could choose anyone of them, given that you've passed the 3rd interview prior to the first batch.
CX covers your transportation between HKG and ADL for flight grading, but CX does not cover the airfare for you to go to HKG for any of the interviews.
Capiche?