glass bottles: 1 million years
plastic bags: ~500 years
plastic beverage bottles: ~500 years
aluminum cans: 80-200 years
cigarette butts: 1-5 years
newspapers: 2-4 weeks, though landfill studies have found legible newspapers dating back 15 years
apple cores: 1-2 months, though, like all things, can be much slower in airless conditions.