If the balloons are properly inflated (ie. not over- or under-inflated) they will last about 12-18 hours if helium filled and 5-7 days if air filled. Actual flying time will vary depending on temperature and atmospheric conditions. **If left outside in the hot sun or rain, the balloons will last only a few hours.**
WARNING! CHOKING HAZARD - Children under 8 years can choke or suffocate on uninflated or broken balloons. Adult supervision required. Keep uninflated balloons away from children. Discard broken balloons at once.