How long did it take to invent the plane?

Answer 1

A specific time frame cannot be established as it is unknown when research began into creating objects that could fly.

The first plane was invented by the Wright Brothers on December 17, 1903. Although there is dispute that these people invented the firstb plane.

Research first began into this sort of stuff in 1889. a German engineer named Otto Lilienthal, inspired by the flight habits of storks, published "Bird Flight as the Basis of Aviation." Two years later he built his first simple glider.

So it depends on what you define as a plane i guess.