The planning fallacy suggests that we underestimate how much time a task will take.
Unless you use a time-tracking system or pay keen attention to how long tasks take you regularly, you might not know where to begin when setting time limits for your to-do items. If you don’t already know how long tasks take you to complete, you’ll have to start with your best guess. As it turns out — we aren’t always great at estimating how much time it will take us to do certain things because of the planning fallacy. The planning fallacy suggests that we underestimate how much time a task will take. We can attribute underestimations to failing to understand how long it took us to complete similar tasks previously and assuming that we won’t run into any hiccups along the way.