I want to do 2 balloon towers for my son's birthday that are about 5' tall. The party starts at 5 pm and ends at 9 pm. How early can I blow up the balloons and build the tower?
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How far in advance can I start my balloon tower?
I suppose you are talking about air filled balloon columns (or towers, as you called them).
Some professionals blow up their air filled balloons up to 3 weeks before the event, but I would suggest you should inflate them a maximum of 5 days in advance. To prevent them from oxidising it's very important to store the balloons in a clear plastic bag, that closes tightly over the balloons. Large trash bags or mattress bags will do the job just fine.