Rates of Decomposition for various forms of litter

Paper 2-5 months
Orange Peels 6 months
Milk Cartons - 5 years
Filter Tip Cigarettes 10-12 years
Plastic Bags 10-20 years
Leather Shoes 25-40 years
Plastic Containers 50-80 years
Tin Cans 100 years
Aluminum Cans 200-500 years
Styrofoam NEVER