The longevity of helium-filled balloons depends on various factors, including the type of balloon, the environment, and the quality of the helium. Here's a breakdown for How long does helium last in balloons:

Latex Balloons: Latex balloons are more porous than other materials, allowing helium to escape more quickly. On average, helium-filled latex balloons may start to lose their buoyancy within 12 to 24 hours. While some may still float for a day or two, the helium can dissipate more rapidly, and balloons may not remain fully inflated for an extended period.

Mylar Balloons: Mylar balloons, made of a metallic-coated polyester film, are less permeable than latex balloons. They can hold helium for a more extended period, often lasting several days to a few weeks. Mylar balloons are a popular choice for events and parties when a longer floating time is desired.

Environmental Factors: The surrounding environment plays a role in helium balloon longevity. Factors such as temperature, humidity, and altitude can impact the rate at which helium escapes from balloons. Warmer temperatures and higher altitudes can lead to faster helium dissipation.

Tying and Sealing: Properly tying balloons and ensuring a secure seal can help retain helium and prolong buoyancy. Even a small leak can significantly affect the duration of a balloon's float time.

While Mylar balloons generally have a longer float time compared to latex balloons, it's essential to consider the intended use and the desired duration of float time when choosing balloon types. It's also worth noting that helium is a finite resource, and its availability can impact the cost and availability of helium-filled balloons. For the best results, store balloons in a cool, dry place and avoid exposing them to direct sunlight or extreme temperatures.