I don't remember for sure without looking into exif (in the office now), but judging from the shot it's not more than 0.5 sec. I'm very picky about those exposures, I don't like it when the water loses all texture and turns info the fog. On the other side it should be long enough to avoid chaos and cluttering. So should be 0.3-0.5 sec. I can have a look later.