I want to use these for a party I'm having in a few days. I plan to decorate around 1pm. Nowadays it doesn't get dark until 9 p.m. I was afraid the light wouldn't last into the night. I blew up one of these yesterday afternoon to test it out. It's 5:45pm and it's still going. At the moment it took 29 hours. I inflated it with regular air. I can't say anything about the use of helium.
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