Transfer time from Ferry to Bus?

I will be arriving in Fukuoka on August 1 2011 via Ferry from South Korea. My ferry will arrive at the port at 6:55pm. However, my Willer Express bus leaves at 8pm from Hakata station. Do you think I will have enough time to go through immigration and make it to the station in time? The next bus leaving for Osaka leaves from the same station at 10pm, but I am a bit weary about staying at a station by myself for a few hours at night.

Beetle (Ferry name) "Green Seat" passanger first then other lower class passenger out.
but, can over take between ferry door and immigration by runnnig :D
if can, 5-10min out immigration.