Hi daisukey and welcome back to the forum
Once you have your PR, for the next 2 years, you must spend at least 1 year in NZ to retain your PR, of which 6 months should be spent in NZ in the first year and 6 months in the second year, i.e. you cannot get PR, leave NZ for one year and come back for the second year. Hope that makes sense!
It will be fine, under those circumstances, to go back to your home country for 2 weeks :023: