I heard that the PR is for life, but not sure if that is confirmed.
Answers
On
Venkateswaran Palat Krishnan answered:
New Zealand Permanent Resident Visa permits to travel to and from New Zealand any time you like, without a time limit on stay in New Zealand. If you want to travel, your visa must be in a valid passport. If your passport expires, you must apply to transfer your visa to a new passport before you can travel.
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Richard Wu answered:
If prv, it is for life at the current policy.
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Aleks Jovanovic answered:
Please note that initial resident visa is issued with two years of travel conditions. Then after two years resident visa holder can apply for permanent resident visa (PRV). Once a person has PRV they don't need to come to NZ anymore unless they wish to do so.