"Claude sized a feature at four to five days, unprompted, then we shipped it in a few hours. It estimates in human days because everything it knows about estimating came from humans with calendars. A quirk, mostly, and a reminder that I don't size work in days anymore. https://jonathannen.com/four-to-five-days/

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Filed under AI, Code, and 100PR .

Published: 27 Oct 2026 by Jon Williams. Follow me x.com/jonathannen..