Generally, 12-inch latex balloons filled with helium will float between 6-10 hours. Balloons filled with air will stay inflated between 8-10 hours outdoors and 12-20 hours indoors. Avoid placing balloons near sources of heat and direct sunlight. Helium is sensitive to temperature. For outdoor displays, under-inflate the balloon by first over-inflating the balloons then releasing gas so the balloon can easily expand later. In preparation for a party, test only one balloon the day before to monitor heat, humidity, or rain in your environment. CAUTION: Please avoid contact in case of latex allergy as products are made of natural rubber latex! Popped latex balloons are a chocking hazard to children under 8 years. Please supervise energetic and playful pets from accidentally popping balloons.