Guided tours around either Aboa Vetus or Ars Nova last for an hour. Touring both sides takes 1.5 hours. If the tour is just of one side, the group can visit the other side after the tour (within opening hours).
For one group the recommended maximum size is 30 persons per guide (there is no minimum size). If the group is larger, you can book several guides. A maximum of three groups can start the guided tour at the same time on the same side of the museum.