To 13 ports; the busiest crossings are to Lavrio (1 hour 5 minutes, about three times a day in season), Serifos (50 minutes, 12 times a week, late May to October), Sifnos (1 hour 20 minutes, 12 times a week, late May to October), Kimolos (2 hours 40 minutes, every day in season), Milos (2 hours 10 minutes, six times a week in season), Piraeus (1 hour 35 minutes, five times a week, June to October), Kea (an hour and a half, twice a week) and Syros (2 hours 40 minutes, twice a week).