Comments by "Immudzen" (@Immudzen) on "Why Software Estimations Are Always Wrong" video.

Even simple tasks can have massively wrong time estimates. I worked on something recently that I thought would take just a few hours and instead it took 3 days to do. Once I was actually building the system I noticed that the data I was working with had a number of mathematical properties that made the problem much harder to solve. Trying to do that analysis ahead of time to come up with an estimate would have been most of the time to solve the problem. At least in my case, nobody really cared that it took longer they just cared that it was as correct as we could reasonably make it.
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