During a recent trip with Mattias Fahlgren I tried shooting a really long exposure, around 7 minutes (427sec). It came out ok I think. I'm a bit disappointed with the composition though, I should have placed the lamp post a bit further to the left, away from the pier. But since I forgot to put the nd-filter on for the first 7min attempt and it was quite cold, I didnt feel like standing there for another 7 :)
Shot at Segerstad, Värmland, Sweden.