If you prefer to approach it from a full understanding of the fundamentals, like how jQuery instructions get translated to result in the browser, it's going to

If you prefer to approach it from a full understanding of the fundamentals, like how jQuery instructions get translated to result in the browser, it's going to take a very long time. People go to university for four years and many don't understand fully. On the other hand, if you can ignore your tendency to understand things and limit your scope to shallow understanding of the top 1 or 2 tiers of the stack, then you can learn enough to be useful within a short amount of time.