To adequately cover both the North and South Islands of New Zealand, a minimum of 14 to 21 days is highly recommended. While a 10-day "highlights" itinerary is possible if you utilize domestic flights between major hubs like Auckland, Rotorua, and Queenstown, it often feels rushed and excludes the remote beauty of the West Coast or Northland. A two-week trip allows for a more balanced pace, typically spending 5 days in the North Island to experience Maori culture and geothermal wonders, and 9 days in the South Island for the dramatic Southern Alps and Fiordland. If you have three weeks, you can truly embrace the "slow travel" lifestyle, exploring hidden gems like the Coromandel Peninsula, the Abel Tasman coastal track, and the rugged Catlins. New Zealand’s geography is deceptively large and many roads are winding, single-lane routes, so the extra time ensures you aren't spending your entire vacation behind the wheel of a campervan.