Darwin took 21 years to publish his findings on evolution. In fact he couldn't finish the actual book that he had set out to write and published a summarized abstract instead, which is what we know as On the Origin of Species.
Plus he would have kept working on it until Alfred Wallace wrote him a letter about coming up with his own idea independently so it was publish together or get beat to the punch.
Plus he would have kept working on it until Alfred Wallace wrote him a letter about coming up with his own idea independently so it was publish together or get beat to the punch.