Two week McDonald's and Burger King (Hungry Jacks) experiment from a guy in Australia.
For his experiment, he ordered the happy meals and just let them sit unwrapped in their boxes for two weeks. The cheeseburgers (with ketchup/mustard) still had moisture in them and as a result, they both had fair amounts of mold growing on them.
No surprise.
http://www.youtube.com/watch?v=Dg_CB_HMzXw
at 4 weeks they were both pretty bad. Health hazard bad.
http://www.youtube.com/watch?v=q1XgAbhwUps&NR=1
It's fair to assume that anyone with a burger that lasted over a week with no mold (due to drying out) probably bought it somewhere dry or stored it under conditions that allowed the burger to dry out (no condiments, maybe laid out separately to prevent moisture from being trapped between the meat and bun).
