How long did your latex helium balloon stay up? (science experiment)?

We are doing a science experiment for my kindergartner. It's to see which balloon would stay up longest. a rubber latex balloon or a foil mylar balloon. Of course the foil balloon will stay up longest but my 5 yr old didn't know that and its fun for a easy science experiment for a child in kindergarten.. :) but anyways, to get to the point, the latex rubber balloon only stayed up for 22 hours before it fell straight to the floor. i coulda worn it would stay up longer than that, so i figured i would ask how long your latex rubber balloons stayed up that you got for a birthday or special occasion... :) Thank you!
 
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