It took 3 months. 2 rounds of interviews. The 1st round is with CIO + manager / supervisor; The 2nd round is another CIO + HR. Questions on the 2nd round with CIO is more aggressive and challenging. Try your best to answer, but be honest if you don't know the answer. I passed all interviews, provided payslips and HKID, and it turned out to be rejected by BJ head-quarter. It is because they use a job title which is more technical-oriented in order to get it approved more easily (as it is an existing headcount), but the head-quarter rejected because I'm not technical enough for this job title ...

generally speaking there will be three+ rounds, for the longest one lasted around 40-60 minutes, whilst the shortest one is about 15-20 minutes, each round emphasising different aspects (technical/behavioural/personal and CV experience).