To truly see "all" of New Zealand—meaning the major highlights of both the North and South Islands—you should plan for a minimum of 21 to 28 days. While you can see the primary landmarks of a single island in about 10 to 14 days, a comprehensive trip requires significant travel time due to the country's rugged geography and winding roads. A 3-week itinerary typically includes the geothermal wonders of Rotorua, the cultural hub of Auckland, and the stunning beaches of the Bay of Islands in the North. In the South, you would need time for the Southern Alps, the "adventure capital" of Queenstown, the fjords of Milford Sound, and the glaciers of the West Coast. If you have only 14 days, it is often recommended to focus exclusively on one island to avoid spending the majority of your trip in a car or on a plane. For those who want to include off-the-beaten-path locations like the Catlins or the far north's Cape Reinga, a month-long journey is ideal to allow for a "slow travel" pace that matches the country's relaxed lifestyle and stunning natural beauty.