3 days, not a few months.
But, it occurs to me, you could plant dent corn for ethonol on these plots - humans can’t digest dent corn, and who cares how polluted the soil is?
Google urban food gardening and you might find it a bit uncomfortable to consider the possibility that this is all a set-up to establish subsistence food security.
These are already widely used in Cuba, Venezuela, Congo, Ghana, China etc. all supported through the UN.
http://www.un.org/apps/news/story.asp?NewsID=38691&Cr=democratic&Cr1=congo
Now don’t forget about that change in the farming laws that we were all up in arms about. You know, The Food Safety Modernization Act (S. 510), which ramped up regulation of small farms. 0bama signed that on 1/4/2011.
This regulation will establish mandatory, science-based, minimum standards for the safe growing, harvesting, sorting, packing, and storage of fresh fruits and vegetables. This will be a monumental shift in food safety, says James R. Gorny, Ph.D., FDAs senior advisor for produce safety. http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm262031.htm
Almost sounds like it is going to be too costly and create food shortages due to regulation and farmers refusing to farm. Growing local will become the norm not the exception.