To 21 ports; the busiest crossings are to Piraeus (3 hours 20 minutes, about six times a day in season), Sifnos (35 minutes, about seven times a day in season), Naxos (2 hours 5 minutes, about six times a day in season), Mykonos (2 hours 40 minutes, six times a day, late March to October), Folegandros (55 minutes, about five times a day in season), Santorini (1 hour 50 minutes, about five times a day in season), Paros (an hour and a half, about four times a day in season) and Serifos (1 hour 10 minutes, about three times a day in season).