If you put a couple slices of bread in jar and leave the outside how long will it take for to mold?

The time it takes for bread to mold depends on several factors, including the type of bread, the temperature and humidity of the environment, and the presence of mold spores. In general, bread will start to mold within 2 to 3 days at room temperature, but it can last up to a week or more if it is refrigerated or frozen.

Here are some tips for preventing mold from growing on bread:

* Store bread in a cool, dry place.

* Keep bread in an airtight container.

* If you are storing bread for more than a few days, consider freezing it.

* Discard any bread that has mold on it.

Mold can cause health problems, so it is important to take steps to prevent it from growing on your food.