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I spent several weeks focusing on a single project, only to find out I was confused and wasted my time.

I'm not even sure how I managed to go so far without realizing it. It's never happened to me before. Brutal.

Weeks? That's early detection; that's success :) The longest example of that who I know of is a guy who hired me around 10 years ago; at that time his company was 15 years old and he had not made any money with it. I spoke to him 2 years ago, so his company 23 years or so old; he decided to close up shop as after 23 years he found that what he did was useless and a waste of time. 23 years. 23 years without earning any(! seriously) money and chasing a product no-one (in hindsight) will ever want. That is brutal.

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