I agree with you on a certain level, since there are so many outside factors influencing how quickly you can become a good programmer. It's not as if you are an average programmer for 10,000 hours and then you magically become a great programmer in the 10,001st hour.
That being said, I don't think the estimate is totally wrong. I've been programming for five years, have just gotten through a Software Engineering degree and am comfortable using three or four languages, but there are many people around me with more experience who's development skills I am just in awe of.
The main point is that nobody can teach themselves to be a programmer (or at least a good one) in three days. To build up the amount of skills and experience required takes many years.
That being said, I don't think the estimate is totally wrong. I've been programming for five years, have just gotten through a Software Engineering degree and am comfortable using three or four languages, but there are many people around me with more experience who's development skills I am just in awe of.
The main point is that nobody can teach themselves to be a programmer (or at least a good one) in three days. To build up the amount of skills and experience required takes many years.