How long do Helium balloons last?
Helium normally lasts 6 to 24 hours in latex balloons, depending on weather conditions. Metallic balloons usually last for a week up to a month or longer. Sunny and hot days, will cause latex balloons with helium to expand, resulting in even the best quality balloons bursting. Cold weather will cause balloons to shrink, but will expand back to normal size in warmer temperatures.