Ideally, to truly soak in its essence, a 5 to 7-day trip would be perfect. This allows you ample time to explore iconic landmarks like the Hagia Sophia, Topkapi Palace, and the bustling Grand Bazaar, while also leaving room for leisurely strolls along the Bosphorus, savoring local delicacies, and perhaps even catching a mesmerizing Whirling Dervish performance. However, even a shorter 3-day trip can give you a delightful taste of the city's highlights. Ultimately, no matter how long you stay, Istanbul is sure to leave an indelible mark on your traveler's heart.