You can take the high speed ferry (30 mins)
The regular ferry which can go anywhere from (50 minutes to 65 if the seas are choppy)
The Highspeed is a bit more $$$ but you will NEVER feel sea sick or even notice the waves on the stormiest of seas, it's incredible.
Here is some information on the FERRY PRICING and travel so come visit BI soon!
Have questions let me know.