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Of the variety of explanations for why we underestimate the amount of time something will take, I believe social pressure is the most interesting. One study found that if people estimated anonymously how long it would take to complete a task they were no longer guilty of the planning fallacy.9 This implies that often we actually know we can’t do things in a given time frame, but we don’t want to admit it to someone.
Social preassure and time estimates
