Board Thread:Theories and Speculation/@comment-24901923-20161130025154/@comment-4080775-20161130095917

Based off that logic, Minato wouldn't have never developed the Rasengan and Naruto would have never developed the Rasenshuriken. Persistence is key. People go to college for years on end to get a degree in the field they want. The goal in this situation is the end result of combining and developing the technique that does what you want it to. Also, clones can help decrease this time by multiple magnitudes, as Naruto has proven.