⌛ Why Your Time Estimate Is Always Wrong
What a room full of thesis students got wrong about their own deadlines.
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🎓 The Level-Up
The Thesis That Outran Its Own Worst-Case Guess
In a 1994 study, psychologists Roger Buehler, Dale Griffin, and Michael Ross asked psychology students working on their senior thesis to predict how long it would take to finish — both their best-guess estimate and a pessimistic "worst-case" estimate assuming everything went wrong.
⌛ The average thesis took about 55.5 days to finish — beating even students' own pessimistic worst-case estimate of 48.6 days — and only about 3 in 10 students finished by their optimistic best-guess deadline.
Researchers call this the planning fallacy: we tend to plan based on how a task goes when everything cooperates, underweighting the interruptions and complications that show up almost every time — even though we can usually remember them happening on every past project.
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⌛ Plan for the Real Version of You
- Take your gut-feeling time estimate for a task, then double it — this alone gets most estimates much closer to reality.
- Look at how long a similar task actually took you last time, not how long you assumed it would take.
- Build in a buffer specifically for interruptions; assume at least one will happen, because it usually does.
- Start bigger tasks earlier than feels necessary — the version of you with time to spare rarely regrets it.
👉 Try This Today
You're not bad at planning. You're human — and now you know the correction to make. ⌛