On average our latex balloons stay fully infalted in stable conditions (indoors, temperature controled and avoiding abrasive surfaces) for 3-5 days, if not longer. Our foil balloons have a similar life expectancy, though often times superceed this timeframe up to 3-4 weeks on average. It is common for customers of ours who return to us saying that they had to eventually just "throw the balloons away as they lasted too long", often times this can be years. We have a few balloons in our store that have blown even us away, some of which are meeting their 4+ year mark of no touch ups/refills. PRO TIP: If you are worried about life expectancy, consult one of our designer's or retail assistants to offer their advice on how to prolong the life of your balloons. We will often tell you that the best way to get the most "bang for your buck" is to order ahead and pickup as close to your party time as possible as we then have amble time to prevent & correct any issues in regards to damages made by issues in manufaction.