Istanbul demands a minimum of two days, but we'd suggest at least four days to do it justice. Even with a week, you'd find yourself running out of time trying to tackle everything the city has to offer.

For a first-time visitor in 2026, 3 to 4 full days is generally considered the "sweet spot" to experience the primary highlights of Istanbul. A 3-day itinerary allows you to explore the historic heart of Sultanahmet (Hagia Sophia, Blue Mosque, Topkapi Palace), shop at the Grand Bazaar, and take a scenic Bosphorus cruise. Adding a 4th day gives you the flexibility to cross into the Asian side (Kadikoy and Uskudar) for an authentic food tour or visit the modern Galata and Taksim areas without feeling rushed. If you have 5 to 7 days, you can dive much deeper into the city’s layers, visiting the colorful neighborhoods of Balat and Fener, enjoying a traditional Turkish bath (Hamam), and perhaps taking a day trip to the Princes' Islands. Istanbul is a massive, multi-continental metropolis, so while 4 days covers the "must-sees," you could easily spend two weeks there and still discover new hidden courtyards and rooftop cafes every day.