In 2026, 4 days in Prague is widely considered the "perfect" amount of time for most travelers, rather than being too long. Prague is a dense, walkable city with an immense amount of history packed into its districts. Two days are typically required just to cover the "Big Three": the Old Town Square (Staroměstské náměstí) with its Astronomical Clock, the iconic Charles Bridge, and the massive Prague Castle complex, which is the largest ancient castle in the world. A third day allows for a deeper dive into the Jewish Quarter (Josefov) or a climb up Petřín Hill for panoramic views. Having a fourth day is the "secret sauce" of a great trip, as it permits a relaxed pace to explore the burgeoning foodie scene in Karlín or take a half-day trip to the bone church in Kutná Hora or the brewery in Plzeň. Since Prague has become significantly more crowded in recent years, a 4-day stay allows you to visit major sites very early in the morning and retreat to hidden gardens or cafes during the peak mid-day tourist rush, avoiding burnout.