You mentioned two examples: (1) an existing fireworks stand that is allowed to operate at the same location although the sale of fireworks is otherwise prohibited; and (2) a sign that was erected in violation of a zoning ordinance but which has never been removed.
New hair will not grow back in the previously waxed area for four to six weeks, although some people will start to see regrowth in only a week due to some of their hair being on a different growth cycle.
You have to keep retwisting your hair through out the process. Some  people use beez wax others use Gel or Creams that specialize for  the locking purpose. It take about 8 months to complete the  process; in some cases it also depends on your hair texture.