Latex last 6-8 hours Mylar last 24+ hours. Small 9in latex last around 4-5 hours Large 24-36 in latex last about 12 hours. If you need your latex to last longer ask for the high float serum. Also due to the national helium shortage its best to call in advance and verify they have helium. Party city is on a government ration list, they are only given so many tanks. The amount of tanks given is out of there control. It's as inconvenient for the store as it is the customer. They can however still inflate balloons but with AIR thus its a non floating balloon. It will last just as long. Air filled balloons can be hung, stuck to walls, or used for more creative ideas like arches or columns.
It depends how much air you give it lol
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