Two full days is enough for the heart of Bologna. The centre is compact and walkable under its porticoes, so Piazza Maggiore and San Petronio, the climb up the Asinelli tower, the Quadrilatero market, the Archiginnasio, Santo Stefano and the university quarter all fit without a rush. The one thing to book is the Asinelli tower, which sells timed tickets online, so grab a morning slot a day or two ahead. Base yourself in the centro storico so the towers, the basilica and the markets are minutes from your door. Day one takes Piazza Maggiore and San Petronio, the booked tower climb, a Quadrilatero lunch, the Archiginnasio and Santo Stefano, then a dinner of tortellini and tagliatelle. Day two does the university quarter and the Pinacoteca, the little canal window, a market lunch and the long portico up to San Luca, then an aperitivo. What you give up at this pace is a day trip and the modern-art museum. For Modena or Ferrara, or MAMbo and the Morandi rooms, take the three-day version.