You can learn a lot in 20 hours, you can't learn all you need in 20 hours. The key is maintaining a fine balance between learning(READING) and doing(LEARNING).

You can learn a lot in 20 hours, you can't learn all you need in 20 hours. The key is maintaining a fine balance between learning(READING) and doing(LEARNING). With google/stackoverflow, one can do a lot without understanding much, kinda bruteforce your way to the solution. Just start doing, there was a post where someone learned to program by building a small project everyday for about 180days, that's more like it. Take that approach, start building everyday, non stop. Don't worry about the amount of time, just finish whatever you start.