How long does a balloon hold air?

The duration a balloon holds air depends on several factors, including the type of balloon, environmental conditions, and how well it is sealed. Latex balloons typically last about 12 to 24 hours, while mylar (foil) balloons can last several days to weeks. However, factors like temperature, humidity, and exposure to sunlight can affect their longevity. Over time, balloons will gradually lose air through tiny pores, leading to deflation.