To 20 ports; the busiest crossings are to Sifnos (40 minutes, about three times a day in season), Serifos (1 hour 20 minutes, 11 times a week in season), Milos (25 minutes, 10 times a week in season), Folegandros (40 minutes, 10 times a week in season), Sikinos (1 hour 10 minutes, 10 times a week in season), Ios (an hour and a half, 10 times a week in season), Syros (6½ hours, 10 times a week in season) and Santorini (2 hours 20 minutes, nine times a week in season).