there's probabaly a lot of variables in that depending on where/when you gained qualifications and experience. Just talk to them.
this from their site
www.mcnz.org.nz
How long will it take to get registered?
Timeframe for the application for registration process is dependent on many factors:
Is the application form complete?
Do we have all the necessary accompanying documentation: such as references, certificates of good standing, qualification and examination results? This is important as we cannot consider your application until we have all the information.
Which registration pathway are you taking? Some pathways, for instance the Vocational pathway for specialist doctors take much longer and involve many more steps to registration.
Excluding the vocational registrations for doctors from overseas, we aim to process applications within 20 working days.
We can only begin processing your application after we have:
received payment
received a complete application
and all accompanying documentation is attached
Use the registration self assessment tool to determine your appropriate registration pathway. Alternatively, refer to the registration pathways diagram.