To 18 ports; the busiest crossings are to Santorini (45 minutes, about five times a day in season), Milos (55 minutes, about six times a day in season), Sifnos (1 hour 35 minutes, about five times a day in season), Piraeus (4 hours 25 minutes, about four times a day in season), Naxos (2 hours 25 minutes, about four times a day in season), Mykonos (3 hours 10 minutes, four times a day, late March to October), Ios (40 minutes, about three times a day in season) and Sikinos (20 minutes, about twice a day in season).