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500 years.
It would depend on the composition of the plastic bag and its disposal environment. Plastic bags can take hundreds of years to decompose.

Some supermarkets implemented environmentally friendly plastic bags that could decompose/compost in a year or less under exposure to air and sunlight. However when the bags were dumped in a landfill, they were covered with other trash eliminating exposure to air and sunlight, inhibiting decomposition, resulting in the plastic bags staying around much longer.

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