it took about a year for the first hot air balloon to be made.
i dont know. Why dont you try making one and find out.
I wish I knew
The first nonstop balloon flight around the world took 19 days, 21 hours, and 55 miles.
As long as they have flue to heat the balloon.
it took 50 years to build it was the wrights plane
25 years
25 years
Hot air balloons, unlike zeppelins, are not intended to be used for long-distance or long-duration flights, and they do not have toilet facilities. If you are planning to go up in such a balloon, try to use a toilet on the ground, first.
2 years
5 weeks
As long as the buoyancy due to a lighter gas inside the balloon is sufficient to offset the mass of the balloon (and any string). The gas will gradually diffuse out, through the skin of the balloon and so the balloon will slowly lose its buoyancy.
Before you ask the questiion how long did it take to build, you must first ask yourself, "did they have enough financial support to build the International Finance Center?"