It's not about languages. With a certain level of experience languages can be learned to a useful point in a weekend. The problem is the knowledge of the platfo

It's not about languages. With a certain level of experience languages can be learned to a useful point in a weekend. The problem is the knowledge of the platform, the APIs, the problems each platform has, which parts you should use, which parts you should avoid, what performs better, what hangs your app, what renders things poorly. All those things require a lot more time to learn.