Three days in Vienna is a good starting point to explore the city's main attractions and get a taste of its rich culture and history. While you may not be able to delve deep into every aspect of the city or visit every museum, you can cover the highlights and most important landmarks during a well-planned 3-day trip. However, if you want to truly immerse yourself in Vienna's art, music, and cuisine, or take day trips to nearby destinations, you may want to consider a longer stay.