I composted a corn-plastic salad container in a pile. reduced to nothing in the 6 month turnover time of the pile.
This early article on the corn-starch-based plastics claims four months: http://www.popsci.com/environment/article/2008-04/biodegradable-plastics
Based on this recent article from the Smithsonian, packaging material made from corn can break down into water and carbon dioxide in only 90 days, but in a “controlled composting environment.” This means that it will not break down that fast in your bin or pile in your backyard, but rather can decompose that quickly in a large, heated compost facility, which there are only 113 of worldwide.
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