It wasn't very precise. I figured that a highly skilled polymath in a modern economy can usually earn US$150k per year, and that this is a bit less than half of a working year. How much do you figure?
Your numbers sound so out-of-whack because you're assuming that only a person with the skills to earn $150k is capable of building a small stone hut in a third of a year.
And if you read the article itself, a third of the time is spent waiting for unseasonal rain to stop.
I don't think my numbers sound out-of-whack; no, I wasn't assuming that; and yes, I did read the article, in full, and my comment is informed by that. Also, I think your aggressive tone is uncalled for and frankly kind of bizarre.