My advy character on Dwilight set out to travel from Port Nebel to Mimer by sea a couple of days ago. After 46 hours at sea it tells me he's arrived in Port Nebel, i.e. where he started. There was no explanation like "Your ship had to turn back because of bad weather," or sea monsters, or anything like that. Just "Ok, you've arrived at your destination."
Speaking of which, priest travel over long distances looks bugged. Hours all get taken away at once, and then over time (not sure if over actual hours or turns), the time left lowers. Then, you get stuck at 1 hour before arrival for multiple days before you actually do arrive.