How long did it take Marx to write Capital because damn it's so well written

Like the analysis of commodities in chapter 1 concluding with the fact that money is a commodity and how chapter 2 to 3 builds on that. What's more the C-M-C formula in chapter 3 directly corroliating with the 20yrd=1 coat 1 because if u bring it down to brass tracks since money is a commodity it's basically the ridiculous commodity exchange Marx brought up in chapter 1.

So good. I don't think I understand Marx's critique of money as well as I should but I absolutely love the way he builds up on his ideas especially in these first few chapters.