The maximum was 30 seconds, it was hard because I wanted me to be blurred as well as the sea, so I had to use the manual focus to get it just right. I am happy with the results though - those pictures were actually taken to win a competition for a 400d so lets hope they're good enough :)
Yeah it's cool - they didn't turn out how I planned so when the weather gets better I will try again :)
Thanks TS :D