An hour on the calendar is not an hour of you
Every slot on a calendar looks the same size. The person sitting in it is not. A way to plan the week around when you are sharp, flat and sociable, and why the flat hours are not wasted.
The UnaTask team, Building UnaTask. Mar 10, 2027. 6 min read.
It is Thursday at four. On Monday you looked at the week, found a clean two hour gap, and put the hardest thing on your list in it: the strategy memo that needs you to hold six arguments in your head at once. The gap was free. The calendar said so.
Now you are in it, and you have read the same paragraph four times. You open the memo, you open your email, you make tea. At six you have a heading and a bullet point. The time was there. You just were not.
Why the tidy week goes wrong
A calendar treats every hour as interchangeable. Nine in the morning and four in the afternoon are the same height on the grid, the same colour when empty, equally bookable. That is a reasonable thing for a grid to do. It is a terrible assumption for a plan to make.
You already know your hours are not equal. There is a stretch of the day when hard thinking comes easily, a stretch after lunch when it very much does not, and a stretch when you are happy to talk to people but could not write a careful paragraph to save your life. Most of us know roughly where those stretches fall. Almost none of us plan with them.
The cost is not just the one bad Thursday. It is that the memo gets two hours of your worst attention, runs over, spills into Friday, and the thing that was supposed to live on Friday morning, your best hours, gets pushed into a reply to someone who could have waited.
The turn: sort the work by what it costs you
Time blocking decides when work happens. Energy planning decides which hours each kind of work deserves.
The change is small. Before you place a task, ask what it will cost you, not how long it will take. Nearly everything on a working list falls into one of three kinds.
- Deep work needs you to hold several things in your head at once: writing, design, analysis, a hard bug. It is the work that suffers most from a tired brain.
- Shallow work needs you to be accurate but not brilliant: invoices, expenses, updating a tracker, answering the eleven replies.
- People work needs you to be present and warm: calls, reviews, one to ones, the conversation you have been postponing.
How it works in a normal week
Spend one week noticing. Three times a day, at ten, at two and at five, give yourself a score from one to three: sharp, fine, flat. Do not change anything yet. You are drawing a map, and a map drawn from memory is mostly folklore. By Friday most people find a clear pattern, and it is often not the one they would have guessed.
Give the sharp hours to deep work, and only deep work. If your sharp stretch is nine to eleven, that is where the memo goes, and nothing else is allowed to live there by default. Two hours a day of your best attention, on the thing that matters, beats six hours of whatever was loudest.
Give the flat hours to shallow work, on purpose. The dip after lunch is not wasted time. It is the right time for the invoices, because invoices do not need you to be brilliant, and doing them in your sharp hours was the real waste. Batch them into one pass so the setup cost is paid once.
Put people in the middle. Meetings and calls tend to go best in the hours when you are awake but not deep, and they are easier to protect around than to protect against. If you can choose when your recurring calls happen, choose the edges of your deep stretch, not its centre.
Reserve the windows, not the tasks. This is what makes it stick. Instead of placing each task every week, reserve the window once: deep work, Tuesday to Thursday, nine to eleven, every week. Admin, every afternoon at four for forty five minutes. Then each week you only decide which deep task goes into the deep window. The shape of the week is already decided, so the arguments about it stop.
One finding worth knowing, offered carefully. In a 2011 study, Mareike Wieth and Rose Zacks found that people solved more insight problems, the kind that need a sudden new angle, at their non optimal time of day, while analytical problems did not get that boost. The flat hours may be a decent time to brainstorm, precisely because your focus is looser. Try it before you believe it.
The same Thursday, planned for the person
Run the week again. The memo lives on Tuesday and Wednesday morning, in two ninety minute stretches at nine, and it is finished by Wednesday lunch because it got your best hours instead of your leftovers. Thursday at four holds the invoices and the replies, which take forty minutes because they were never hard. You leave at six with nothing half done, and you did not work any longer. You just stopped asking your worst hours for your best work.
The bigger idea
Productivity advice usually asks how to get more hours. The better question is which hours. Everybody gets a few genuinely good ones a day, and the difference between a productive week and a busy one is often just whether those hours went to the work that needed them. Plan the energy first. The time mostly takes care of itself.
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