Different littered materials will remain in the natural environment for a varying length of time depending on how quickly they degrade, either biologically, chemically, or because of sunlight. This kind of information can be easily found by doing a web search. The Virginia Department of Environmental Quality published this information on it's web page.
Material Time to Degrade
Piece of Paper 2 to 4 weeks
Orange and Banana peels 2 to 5 weeks
Cotton Rags 1 to 5 months
Disposable diapers 10 to 20 years
Plastic bags 10 to 20 years
Aluminum cans 80 to 100 years
Glass indefinitely
