The working holiday visa allows a stay of up to 12 months and is available to citizens of Australia, Denmark, France, Ireland, New Zealand in the Argentine Republic.
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New Zealanders between the ages of 18-35 years are eligible to apply for 43 long stay visas under the working holiday schemes New Zealand has agreed with other countries.
40workingholidays.com has guides on how to apply for the visas, and how to get setup once you arrive.