As 'Open Roosendaal Castle' does not exist, there is no time duration for a visit.
Since the attraction 'Open Roosendaal Castle' is not a real place, there is no visit duration to provide. Any time spent looking for it would be unproductive because it does not exist in Roosendaal, Netherlands. For those seeking historical experiences in the region, researching existing historical sites or cultural institutions in Roosendaal or nearby Dutch cities would be more fruitful.