I want you to look at your calendar from last week. Look at the shape of the day. When did the most cognitively demanding work happen?

The strategy document, the positioning draft, the hiring decision, the proposal that required you to actually think?

If you are honest, that work probably happened in whatever gap was left after the calls, messages, admin, and reactive tasks that filled the morning.

Which means your most important thinking happened in your most depleted hours, with whatever attention remained after everything else had already claimed it.

This is a cognitive resource problem, and most founders I speak with have been solving it backwards.

Your most important thinking happened in your most depleted hours

They treat focus as something that happens when they find a gap rather than something they protect before the gap disappears.

The result is a week that feels full and produces very little of the work that actually moves anything forward.

The motion is constant. The progress is uneven. And by Friday, the most important thing on the list is still the most important thing on the list.

This post is a diagnostic. It draws on Cal Newport’s framework from Deep Work (2016) and applies it specifically to the way founders and team leaders structure their weeks.

By the end, you will have a clear calculation of how much deep work your current schedule actually allows, a specific method for protecting it, and a standard for what that protected time should produce.

Two Types of Work

Cal Newport, associate professor of computer science at Georgetown University, defines deep work as a professional activity performed in a state of distraction-free concentration that pushes cognitive capability to its limit and creates new value.

Shallow work, by contrast, is logistical and administrative activity that can be performed while distracted and creates significantly lower returns.

Both are real work. Both are necessary. The problem is that they draw from the same finite cognitive resource and produce wildly different outcomes.

The capacity for deep work is becoming rarer and more valuable in knowledge-based economies

Newport’s research found that the capacity for deep work is simultaneously becoming rarer and more valuable in knowledge-based economies.

Professionals who produce three to four hours of genuine deep work per day generate the equivalent output of two to three days of shallow work from someone operating without that discipline.

The gap comes down to cognitive architecture, specifically whether the most demanding tasks get the best hours or the leftover ones.

The first step is to define which tasks in your role actually qualify as deep work. For most founders, this includes strategy, original writing, complex problem-solving, product decisions, and anything that requires sustained synthesis.

Everything else, inbox management, scheduling, status updates, and routine approvals, is shallow. The distinction matters because you cannot manage what you have yet to categorise.

Calculate Your Ratio

Here is the audit. Take last week and assign every working hour to one of two categories: deep or shallow. Count the hours in each. Then divide your deep work hours by your total working hours and multiply by 100.

That percentage is your deep work ratio. For most founders who have never done this exercise, the number falls between 10% and 20%.

For a 50-hour week, that is five to 10 hours of work that actually move the needle. The rest is maintenance.

Research from the McKinsey Global Institute found that knowledge workers spend, on average, 28% of their working week on email alone, and a further 20% searching for information or chasing status updates.

Knowledge workers spend, on average, 28% of their working week on email alone

That is nearly half a working week spent on shallow tasks before a single deep-work hour begins. For founders running lean teams, the proportion is often worse because the low-level tasks stay with the founder rather than being assigned to others.

The target Newport recommends for knowledge workers is four hours of deep work per day. For founders managing teams, client relationships, and operational demands, that ceiling is lower in practice.

The floor matters more than the ceiling. The minimum viable deep work commitment, below which genuine strategic progress stalls, is 90 minutes of protected, distraction-free focus per day.

If your current ratio puts you below that, the calendar is working against the business.

Shallow Work Feels Productive

The most dangerous property of shallow work is that it provides constant feedback. Emails get answered. Tasks get checked off. The inbox reaches zero.

There is a satisfying rhythm to shallow work that deep work takes time to match, because deep work is slow, uncomfortable, and produces nothing immediately visible.

This is why founders drift toward shallow work under pressure. The returns are immediate and legible. The cost is invisible until it compounds.

Research by Sophie Leroy at the University of Washington, published in Organisational Behaviour and Human Decision Processes, introduced the concept of attention residue: the cognitive cost of switching between tasks.

When you move from a shallow task to a deep one, part of your attention remains on the previous task

When you move from a shallow task to a deep one, part of your attention remains on the previous task. The deeper the interruption, the longer the residue persists. A morning built around reactive, shallow work consumes the morning and impairs the afternoon deep-work session that follows.

The fix is sequencing. Shallow work should be done after deep work. Protect the first 90 minutes of your working day for the task that requires the most sustained thinking. Respond to nothing before that session ends.

The inbox will survive. Your best thinking requires a protected slot rather than a gap that never reliably appears.

Schedule by Energy

The calendar fix that changes everything is deceptively simple: stop scheduling based on availability and start scheduling based on cognitive energy. Most digital calendars default to showing free slots, which trains you to treat availability as the primary variable for booking work.

The result is that your most demanding tasks end up wherever the calendar is open, usually after 11am, between calls, or in the late afternoon, when the day has already taken its toll.

Research by Christoph Randler, published in the Harvard Business Review, found that cognitive performance peaks in the late morning for most adults, with a secondary peak in the early evening.

20% of focused effort on the right priority yields 80% of the meaningful progress

The early afternoon, typically between 1pm and 3pm, is the lowest point for alertness and executive function. If your deep work lands in that window by default, your most important thinking is happening at your least capable hour.

The practical standard comes from OKR methodology, specifically the principle that 20% of focused effort on the right priority yields 80% of the meaningful progress.

Applied to your calendar, this means identifying the single task each day that, if completed well, makes the most difference to the week’s outcomes. That task gets the first protected slot of the day, before anything else claims the cognitive resource. Everything else gets scheduled around it.

Protect the 20%

The standard is this: one protected 90-minute deep work block per day, placed in your peak cognitive window, assigned to the highest-leverage task on your list, and treated as non-negotiable.

Newport calls this the deep work schedule, and its power comes from consistency rather than ambition.

Three 90-minute blocks per week of genuine deep work, protected and honoured, will produce more strategic output than 15 hours of fragmented effort.

Your calendar is a leadership document. How you protect your time communicates to your team which priorities are real.

A founder who fills every available slot with meetings trains their team to interrupt freely.

Your calendar is a leadership document

A founder who blocks deep work time and defends it demonstrates that thinking is a production input, and the calendar is the proof.

Block the slot before you close today.

Open your calendar right now and block 90 minutes tomorrow morning, starting no later than 9am, and label it with the specific task that requires your best thinking.

Do not move it. Do not treat it as negotiable when something easier arrives.

That single block, repeated daily, is the habit that builds the thinking your business actually needs. The deep work is the job. Protect it accordingly.