When is it time to take down memorials?

Thought-provoking piece in the New York Times today about the discussions in Newtown, Conn. regarding the spontaneous and often homemade memorials to those who died at Sandy Hook.  The article mentions that many of the flags made from bedsheets, or signs made from plywood violate homeowner's association covenants, but they also violate sign ordinances, zoning, and other laws.  How long is long enough to allow these rules to be bent to allow people to mourn?

Tanya Marsh