>>1819394> How long does id have to take until it is cheaper with a tunnel? Wrong question.
HOW OFTEN is a real question. Ferry or cargo freight is specialized vehicles that cap out on 15-20km/h, and there is only one.
If you need to transport more than 20km once a hour, or 60km each 3 hours, you have a problem that can´t be solved with a ferry.
>but muh speedboatEnergy intensive, and slow for such energy consumption.
Also intense sea sickness.