刚才问了卫生局
得到答复如下
“The eligibility criteria for work permit holders require work permit holders to be able to stay for a consecutive period of two years, including time already spent lawfully in New Zealand.
Your wife would be considered eligible for the full range of publicly funded health and disability services from the time she was issued a work permit which, when combined with time spent lawfully in New Zealand on any other immediately consecutive permit (ie with no gaps), would allow you to meet the 24 month minimum requirement.