Depends on how well sealed it is and the temperature
banana
It rots faster in a container because a sandwich bag holds the moister in.
Salt doesn't normally support mold growth. So sugar molds faster.
between mozzarella and cheddar: mozzarella molds faster bt all cheeses: i think blue cheese
milk molds faster than water. actually im not sure water even molds
Blue moulds faster
Diet Coke from http://www.dallas.net/~mcmanus/mold.htm
Wheat bread molds faster.
Sliced
sourdoogh
Cheese molds faster in sunlight, if that heats it.
Bread gets mold faster in a zip lock bag because when you close the bag it traps air inside and the air the bread is pushing out comes back to the bread and causes it to spoil and get mold. If you put a piece of bread in the bathroom it has space to release the air.