The Election Commission gives losing candidates 3 weeks to collect their signs according to the Tennessean. I think that's too long, and I place this on the campaign supporters. I have collected all the signs I placed, but if you pitched into a campaign by placing signs, I strongly encourage you to do your part and remove what you placed. I hope that everyone will do a little with the signs that are nearby. Even if you did not place a sign, you know which ones need to go.
Elections are messy, but let's all pitch in to at least reduce the criticism that democracy is intrusive.