Determining how many days are "enough" for Australia depends entirely on your scope, but for a first-time international visitor, a minimum of 14 to 21 days is generally recommended to capture the country's diverse highlights. Australia is roughly the size of the contiguous United States, meaning travel times between major hubs like Sydney, Melbourne, and Cairns are significant. A two-week itinerary typically allows for "The Golden Triangle": a few days in Sydney for the Opera House and beaches, a trip to the Great Barrier Reef in Queensland, and a visit to the cultural heart of Melbourne or the Great Ocean Road. If you wish to include the "Red Centre" (Uluru) or the rugged Western Australia coastline (Perth and Exmouth), you would realistically need at least 3 to 4 weeks. In 2026, many travelers are opting for slower, more immersive trips to avoid "burnout" from the long-haul domestic flights. Ultimately, while you can see a single city in 5 days, a three-week window is the high-fidelity standard for experiencing the true scale and variety of the Australian continent.