Plan a day with an amount of work you can finish and spare time for the unexpected.
Before you choose a single task for tomorrow, write down your working hours and subtract everything already spoken for: lunch, meetings, messages and email, and the time you lose moving around. The number left is what you actually have for focused work, and it is usually smaller than you expect.
Most people do it the other way round. They write a to-do list by putting down everything they can think of, in rough order, until the list is long, often twelve or fifteen items. By 6pm four items are done and the list has grown by three (an invented example). The day feels like a failure even after hard work, because the list was never realistic, and the next morning they write another list of fifteen.
In 1979 the psychologists Daniel Kahneman and Amos Tversky named the planning fallacy: the habit of underestimating how long a task will take, even when we know similar tasks took longer in the past. When you imagine a task, you picture it going smoothly. The file that won't open, the colleague who needs to explain something, and the second draft are left out of the picture, so they are left out of the estimate too.
Trying harder to estimate does not fix this, because gut estimates stay optimistic. Two things do help. The first is to check how long similar tasks actually took last time. If you kept the time map from lesson 1.4, look there. The time a past report really took, from opening the file to sending it, is a better estimate than your feeling about the next one. The second is to build slack into the plan on purpose, which is covered further down.
A working day looks like eight or nine hours, but very little of it is free for focused work. The free-hour sum is your working hours minus lunch, meetings, messages and email, and anything else already spoken for. The result is the time you really have for focused work.
Take Priya, an office worker planning her Wednesday (an invented example). She works 8.30am to 6pm, which is 9.5 hours. Lunch takes an hour, leaving 8.5. She has 2.5 hours of meetings. Her time map shows that messages and email take at least 1.5 hours a day, even when she batches them. She is in the office that day, and walking between meeting rooms on two floors and the pantry costs about half an hour. So 8.5 minus 2.5 minus 1.5 minus 0.5 leaves 4 hours of possible focused work, out of a day that looked like nine.
She then keeps one hour as a buffer, which brings her budget for real tasks to 3 hours. The sum takes a minute. Do it every time you plan a day, because it stops you putting six hours of work into a three-hour day.
Next, choose your most important task, or MIT: the single thing that would make the day worthwhile if it were the only thing you finished. It should usually come from one of the weekly outcomes you set in lesson 3.1, "Plan the week before it fills itself".
Do the MIT first if you can. Early in the day there are fewer messages, fewer meetings and fewer reasons to put it off, and once it is done, later interruptions cost you less. If your first hour is always taken, for example by a team stand-up or school drop-off, put the MIT in the first clear slot.
After the MIT, list no more than three other tasks. Four tasks in total is a day you can plausibly finish. Anything you finish beyond those four counts as a bonus, so you are not carrying a backlog into the next day.
Priya's MIT is writing the first half of the campaign brief, which will take two hours. Her other three tasks are checking the report data, sending feedback to the agency, and booking her course module for Thursday evening. Everything fits in roughly three hours, with the buffer behind it.
A buffer is time you deliberately leave unscheduled to absorb unplanned work. When a day looks tight, the buffer is usually the first thing people cut, yet it is the part that keeps the plan working. Every day brings something you did not plan: an urgent client email, a colleague's question that takes 20 minutes, a meeting that overruns. With no room in the plan, the first surprise pushes everything back. By mid-afternoon the plan no longer matches the day and you stop looking at it.
About an hour is a reasonable starting point on a normal day. On a day you know will be chaotic, such as the day before a launch, make the buffer bigger. If it is still unused at the end of the day, you have an hour for the next task on your list.
Keep an eye on how the buffer gets used. If you use all of it every day, that tells you something about your job, and the sensible response is to plan for it instead of pretending it won't happen. Marcus, an operations team lead, found that driver issues between 7 and 9am always used up his buffer. He stopped scheduling anything else in that window and started planning his focused work for 10am instead.
For the next few days, plan on paper or in a single note, in the evening or first thing in the morning. Write the free-hour sum at the top, then the most important task, then up to three others. Keeping it short makes it easy to look at during the day. Tomorrow is a good place to start, and the activity walks you through it.
Plan tomorrow on paper. Count your free hours, pick one most important task, and list up to three others.
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