Time blocking: planning in blocks, not in lists
How to turn a list of intentions into a day you can actually execute.
The principle
A list says what. A calendar says when. Only the second is a decision.
Time blocking means giving every important piece of work a specific slot in the calendar, like an appointment with yourself.
Its main effect: it confronts your intentions with the reality of the hours available. You cannot plan fourteen hours of work into a day that contains six: the arithmetic is visible.
The protocol for planning the day
The evening before, ten minutes. Never in the morning: mornings are for executing.
- Look at the fixed commitments, meetings and appointments. What is left is what you can plan.
- Lay down the one or two deep blocks of ninety minutes first, on your energy peaks. Those are your real priorities.
- Lay down one admin block of forty-five to sixty minutes for short actions, messages and calls, grouped together.
- Lay down the breaks and the transitions. A calendar with no breathing room does not hold.
- Leave thirty to forty per cent of the day empty.
The sixty per cent rule
This is the most important rule in the lesson, and the most broken.
Never plan more than sixty per cent of your available time.
The remaining forty per cent absorbs the unexpected, the overruns and the genuine emergencies. A day planned at a hundred per cent has already failed at the first disruption, and there is always a first disruption.
People who give up on time blocking almost always give up for this reason: they planned at a hundred per cent, they failed three days running, and they concluded that it does not work.
The deep work block
Ninety minutes, one single task defined in writing, on your energy peak, before you look at any messages, protected: phone in another room, notifications off.
The Instant Focus module gives you the start-up ritual and the protocols for protecting those blocks. The two modules are designed to work together: this one decides what, the other makes it possible to do it.
Grouping
Group tasks of the same kind into one block: all the calls, all the messages, all the approvals.
The reason: every context switch costs twenty to forty per cent of effective time. Grouping removes that cost.
Immediate application: three inbox openings a day at fixed times, instead of permanent checking. It is the single change that produces the largest measurable gain in time.
Replanning
You did not hold the two o'clock block? That is not a failure of the system.
Two options: replan it immediately into another slot, or explicitly decide to drop the task this week.
What not to do: leave the block empty with no decision. That is what erodes trust in the calendar.
What happens depending on how full the calendar is
Share of blocks held · observed over one week
Past sixty per cent, every extra point of fill makes the share of blocks held fall. Below forty, the day is underused.
Exercises2
Understanding produces no change. These exercises are what makes the difference: each one has a measurable success criterion.
Planning tomorrow in blocks
Confront your intentions with the reality of the hours available, which a list never does.
Equipment : Your calendar, your action list.
- 1.This evening, look at tomorrow's fixed commitments and work out the time actually available.
- 2.Lay down one or two ninety-minute deep blocks first, on your energy peaks.
- 3.Lay down one grouped admin block.
- 4.Lay down the breaks.
- 5.Check that you have left at least thirty per cent empty. If not, remove blocks.
Success looks like : The day is planned to sixty per cent at most, and the deep blocks sit before any look at your inbox.
The classic mistake : Planning on the morning itself. Mornings are for executing: deciding then burns the executive resource meant for the work.
Going further : Keep the evening planning for five days and compare planned against done each evening.
Five days of planned against done
Learn to estimate, which is the skill most planning lacks.
- 1.Each evening, note the planned duration and the real duration for each block.
- 2.Work out your underestimation coefficient each day: real divided by planned.
- 3.On the fifth day, take the average.
- 4.Apply that coefficient to your next estimates.
Success looks like : You know your coefficient, usually between 1.3 and 1.8, and your estimates become reliable.
The classic mistake : Judging yourself on the gap. The gap is not a fault: it is the data that makes your future planning realistic.
This lesson is part of Organisation & Planning
15 lessons, 4 resources and the complete protocol to install the method in 30 days.