Ferry operating timing

Hi I will be staying at hotel urashima at Kii-katsuura in Dec. I have check the web site and the ferry timing to the hotel end at 1400 and than continue at 1900. I'm worry because I will reach there around 1600. Does anyone know of any other ferry that operate at this hour to hotel urashima from kii-katsuura port? Thanks

I have check the web site and the ferry timing to the hotel end at 1400 and than continue at 1900.

The ferry schedule is a little confusing, but what is written is that between 1600 and 1900 the ferry doesn't run on a set schedule, but goes back and forth constantly as needed. In other words there should be a departure every few minutes.

in Japanese webpage
http://www.hotelurashima.co.jp/koutsu/kame.htm
ピストン運行 means "run more frequently. no stopping until ALL guests can come to their hotel."

Thanks yllwsmrf and ken, at least I can travel peacefully:)