In 2 weeks' time we shall spend 6 hours in Milan (arriving at Central Station at 12:00, storing our luggage at the station and departing same at 18:00). Does this leave us enough time to visit the Duomo, Galleria Vittorio, San Santiro, Pelazzo Reale and the Teatro alla Scala? We plan to take the Metro from the station. Is this the best option? We see that there are two Metros by the same name (Duomo). Where do we get off?