In 1955, the historian Cyril Northcote Parkinson wrote a half-joking essay for The Economist that opened with a line now quoted in every productivity book: work expands so as to fill the time available for its completion. It was meant as satire about bureaucracy. It turned out to be one of the truest observations about how humans actually work.
Give yourself a week to write a proposal and it'll take a week — you'll research, tweak, second-guess and polish right up to the deadline. Give yourself two hours for the same proposal and, remarkably, it gets done in two hours. The task didn't change. The time you allowed it did. The work simply stretched or shrank to fit the container you gave it.
The reason is human, not mysterious. Open-ended time invites procrastination, perfectionism and faff. When there's "plenty of time", the brain treats the task as low-priority and fills the gap with fiddling. A tight deadline removes the room for all that and forces you to focus on what actually matters.
Business owners are especially vulnerable to Parkinson's Law because so much of your work has no external deadline. Nobody's chasing you to update the website, plan the quarter or fix the pricing — so those jobs bloat, drift, and often never get done at all. Meanwhile the day fills with busywork that expanded to swallow every spare minute.
A shop owner sets aside "a day" to sort out a new supplier. The day comes and goes in emails, comparisons and deliberation. Another owner gives the same job a strict 90-minute block on Tuesday morning. She makes a shortlist, calls two suppliers, picks one, and moves on. Same decision, a fraction of the time — and the rest of her Tuesday is free for work that grows the business.
• Set deadlines that feel slightly too short. You'll be surprised how often you hit them
• Time-box everything: "this task gets 45 minutes, then I stop and move on"
• Use it on meetings — book 25 or 45 minutes instead of the lazy default hour
• Batch similar small jobs into one tight window rather than letting them leak across the week
• When a task feels huge, ask: "if I only had two hours, what would I actually do?" Then do that
Don't confuse speed with rushing important, high-stakes work. Parkinson's Law is a tool for the 80% of tasks that don't need to be perfect — it stops them stealing time from the few that do. Use the time you claw back on the work that genuinely deserves care.
Nous tip: for one week, halve the time you'd normally give routine tasks. You'll lose almost no quality and gain hours.