Board Thread:Theories and Speculation/@comment-28323245-20160902000709/@comment-24757127-20160906001620

I think the reason Naruto didn't use Wind Release with anything other than Rasengan is no one in the village had that affinity so he didn't have a proper teacher. Asuma died before he mixed the Rasengan and wind release and we know Danzo isn't teaching ANYONE! Naruto wasn't very creative with techniques as we see over and over again when he almost exclusively uses Rasengan variants. Hw wasn't really a weapon user so doing what Asuma does wouldn't make sense for Naruto. If he had someone like Danzo teaching him then I think he would use those techniques. Also @Namikazenaruto9 has a point about parents teaching their kids. Even though Minato didn't have wind release he could of taught him earlier. If Naruto knew about nature affinities as a young genin then he would have a lot more time to master wind and maybe a second one a bit later.

Now back to the original question: I say it would take Naruto a week or 2. Remember the thing that Kakashi and Yamato were concerned about the shadow clone training method was that Naruto would be so weak that Kurama would break out and control Naruto. That isn't a problem anymore. Kurama is HELPING Naruto now. I bet Naruto would grasp fire release very quickly because of Kurama.