To 16 ports; the busiest crossings are to Piraeus (7½ hours, about four times a day in season), Santorini (1 hour 35 minutes, about twice a day in season), Naxos (3 hours, twice a day, April to October), Paros (3 hours 35 minutes, twice a day, April to October), Mykonos (4 hours 20 minutes, twice a day, April to October), Milos (4 hours 40 minutes, every day), Syros (5 hours 15 minutes, twice a day, April to October) and Serifos (5 hours 35 minutes, six times a week).