I know, most of the time mine get torn down though is if its right in front of a business (they don't like that) but if its on a random street corner it'll stay up for a few days to a week. I've found that the key is to hit the surrounding area just outside the location of an event the night before. That way, you get the most people seeing it THAT day while they go to and from their cars and if its just outside the event's range, the people running it will generally leave them alone.