The lifespan of balloons can vary depending on various factors, including the type of balloon, the material it's made of, and the environmental conditions. Here are some general guidelines:

1. Latex balloons: These are the most common type of balloons used for parties and events. On average, latex balloons filled with helium can last for about 8 to 12 hours before they start to deflate. Over time, helium molecules slowly escape through the latex material, causing the balloon to lose its buoyancy.

2. Foil balloons: Foil or Mylar balloons are made of metallic-coated nylon or polyester materials. They are often used for decorative purposes and can retain helium for a longer time compared to latex balloons. Typically, foil balloons filled with helium can last for several days, ranging from 3 to 7 days or even longer in some cases.

It's important to note that these are general estimates, and the actual duration can vary based on factors such as balloon quality, temperature, altitude, and handling. Additionally, balloons filled with air instead of helium can last much longer, as the air does not escape in the same way helium does.

To maximize the lifespan of balloons, it's recommended to keep them away from sharp objects, extreme heat, and rough handling, as these can cause punctures or damage that shorten their longevity.

Latex balloons, which are made from the sap of rubber trees, are generally considered biodegradable. Latex is a natural material that can break down over time when exposed to the elements (at the rate of an Oak Leaf). When a latex balloon is released outdoors or disposed of properly, it will eventually decompose and return to the environment.

However, it's important to note that the decomposition process of latex balloons can take several months or even years, depending on the environmental conditions. Balloons that end up in bodies of water, such as rivers or oceans, can pose a risk to marine life before they fully biodegrade.

On the other hand, foil balloons, also known as Mylar balloons, are not biodegradable. They are made from metallic-coated nylon or polyester materials, which do not break down naturally. Foil balloons can persist in the environment for a significant period of time, causing potential litter and environmental issues if not properly disposed of.

To minimize the environmental impact of balloons, it is advisable to properly dispose of them after use and avoid releasing them into the environment. Many jurisdictions have regulations or guidelines in place to encourage responsible balloon use and disposal to protect wildlife and ecosystems.