The Planning Fallacy: Why You Always Underestimate Time. This is The Planning Fallacy: a cognitive bias where people consistently underestimate how long tasks will take, even when they’ve failed at similar tasks before. Coined by psychologists Daniel Kahneman and Amos Tversky, it reveals a painful truth: we plan for the ideal world… but live in the messy one. We ignore past delays, unexpected errors, and the sheer weight of reality—because hope feels like strategy. In this 60-second loop of deni