How many weeks does it take for a bird to fly?

Your question is based on a misconception. While some bird species can fly very shortly after hatching, others may take several weeks or even months before they are able to fly. The time it takes for a bird to fly varies greatly depending on the species. For example, some precocial birds, like chickens and ducks, are able to walk and even run shortly after hatching and can fly within a few weeks. On the other hand, altricial birds, such as songbirds and parrots, are born helpless and may take several weeks or months before they are able to fly.