Here are some common objects that end up in landfills or on the side of the road and the estimated time they take to break down. Remember, these are estimates of time and vary depending upon the conditions they are in when they are breaking down, so some of the times may be higher or lower than what is indicated.
How long before it breaks down?
Traffic ticket = 2 to 4 weeks
Rope = 3 to 14 months
Cigarette butt = 2 to 5 years
Painted wooden stake = 13 years
Boot sole = 50 to 80 years
Tin can = 80 to 100 years
Aluminum can = 200 to 500 years
Plastic bag = 100 to 800 years
Glass bottle = unknown.