How long do Helium filled balloons float?

Standard size latex balloons (12") will float for 8-12 hours, However; there is a treatment called Hi-Float which seals the pores of the balloon to make them last 4-5 days. Mylar (foil) balloons float for a minimum of 1 week, and can be re-inflated over and over again. More.

Helium filled latex balloons have a floating time of approximately 12-18 hours. Since helium particles are much smaller than air particles, the helium gas escapes through the latex material much quicker than air. However, floating time can be extended to 1-4 weeks, on average, by treating the balloons with a special compound called Ultra more.

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