To 13 ports; the busiest crossings are to Porto Torres (11 hours, three times a day in season), Palermo (19½ hours, six times a week), Portofino (an hour and a half, 11 times a week, late March to November), Olbia (13 hours, 11 times a week, mid-May to mid-October), Nervi (30 minutes, every day, late March to October), Camogli (50 minutes, every day, late March to October), San Fruttuoso (1 hour 5 minutes, every day, late March to October) and Tunis (24¼ hours, three times a week).