To 15 ports; the busiest crossings are to Skiathos (3 hours 10 minutes, five times a week, late June to early September), Skopelos (3 hours 50 minutes, five times a week, late June to early September), Alonissos (4 hours 20 minutes, five times a week, late June to early September), Limnos (6½ hours, twice a week, July to August and mid-September to May), Mytilene (11 hours, twice a week, July to August and mid-September to May), Chios (14¼ hours, twice a week, July to August and mid-September to May), Samos (17¼ hours, twice a week, July to August and mid-September to May) and Karlovassi (18¼ hours, once a week, mid-September to May).