To 10 ports; the busiest crossings are to Lavrio (an hour, about four times a day in season), Kythnos (1 hour 25 minutes, twice a week), Syros (4 hours 25 minutes, twice a week), Paros (7 hours, once a week), Naxos (8½ hours, once a week), Ios (11 hours, once a week), Sikinos (11¾ hours, once a week) and Folegandros (12¾ hours, once a week).