"Most people overestimate what they can do in a day and underestimate what they can do in a decade"
About this Quote
The quote’s intent is less motivational poster and more cognitive reset. It tells you the unit of measurement is wrong. “Overestimate” isn’t just about optimism; it’s about miscalibrating effort under emotional pressure. Days are volatile: energy swings, interruptions, life happens. A day also tempts performative productivity, where looking busy substitutes for making progress. A decade, by contrast, rewards compounding: skills stack, relationships deepen, reputation accrues, and small decisions harden into identity. It’s the entrepreneur’s worldview rendered in a single contrast, borrowing the logic of investing: consistent contributions beat dramatic bets.
Subtextually, Bartlett is selling patience without sounding like he’s selling patience. It’s a permission slip to be unglamorous today so you can be formidable later. The cultural context is a startup era that fetishizes “overnight success” while quietly running on multi-year iteration, boredom, and repetition. The line works because it punctures the myth and replaces it with a timeline that actually matches how change happens.
Quote Details
| Topic | Time |
|---|---|
| Source | Steven Bartlett, The Diary of a CEO: The 33 Laws of Business and Life (2021) (commonly cited maxim; Bartlett includes/uses it as a principle) |
| Cite |
Citation Formats
APA Style (7th ed.)
Bartlett, Steven. (2026, January 25). Most people overestimate what they can do in a day and underestimate what they can do in a decade. FixQuotes. https://fixquotes.com/quotes/most-people-overestimate-what-they-can-do-in-a-184291/
Chicago Style
Bartlett, Steven. "Most people overestimate what they can do in a day and underestimate what they can do in a decade." FixQuotes. January 25, 2026. https://fixquotes.com/quotes/most-people-overestimate-what-they-can-do-in-a-184291/.
MLA Style (9th ed.)
"Most people overestimate what they can do in a day and underestimate what they can do in a decade." FixQuotes, 25 Jan. 2026, https://fixquotes.com/quotes/most-people-overestimate-what-they-can-do-in-a-184291/. Accessed 13 Feb. 2026.






