In 1956, the cognitive psychologist George A. Miller proposed that the average person can hold about seven pieces of information in their working memory at any given time. Nearly seventy years later, amid the distractions of email, instant messaging, and back-to-back meetings, even that seems optimistic. Despite best intentions, many professionals spend their days reacting – switching between tasks, fielding requests, and rarely finding the focus needed for strategic or creative work. Yet one technique, time blocking, is quietly revolutionising how individuals and organisations manage their time, attention, and energy.
Time blocking is a method of scheduling in which the day is divided into discrete units, or “blocks”, each allocated to a specific task or activity. While this approach may sound rigid, it is, paradoxically, one of the most effective ways to regain flexibility and control. With roots in time management philosophies dating back to Benjamin Franklin – who famously planned his daily schedule by the hour – time blocking has found new relevance in the modern workplace.
Why Time Blocking Works
The effectiveness of time blocking lies in its capacity to minimise what psychologists term “context switching” – the cognitive cost of jumping between unrelated tasks. Research suggests that switching tasks can reduce productivity by as much as 40% and significantly impair working memory. Time blocking counters this by clustering similar types of work together and assigning them clear, uninterrupted windows.
This approach also reduces decision fatigue. According to Roy Baumeister and colleagues, the more choices we make throughout the day, the more our capacity for self-control and sound decision-making diminishes. By deciding in advance when to focus on specific tasks, time blocking preserves cognitive energy for higher-order thinking.
Just as a balanced diet fuels productivity, and physical activity such as walking supports creativity and cognitive clarity, time blocking provides the mental infrastructure that enables all other habits to flourish.
Sheryl Sandberg: A Case Study in Strategic Scheduling
Perhaps one of the most high-profile advocates of disciplined scheduling is Sheryl Sandberg, former Chief Operating Officer at Meta. While managing one of the world’s most influential companies, Sandberg was known for her consistent departure from the office at 5.30 p.m. each day – a decision enabled by her rigorous approach to time blocking.
Sandberg’s calendar was structured to the minute, prioritising essential meetings, high-impact work, and decision-making windows. Equally important were the blocks she reserved for personal commitments, such as family dinners. In interviews, she has spoken of her need to schedule everything from performance reviews to thinking time – not only to ensure things got done but to prevent the erosion of her priorities by the “tyranny of the urgent”. Her approach demonstrates that time blocking is not just a technique for fitting more into the day, but a tool for protecting what matters most.
The Evidence for Structured Time
While Sandberg’s anecdotal example is compelling, research backs up the benefits of scheduling in this way. A review by Brigitte Claessens and colleagues found that individuals who adopted time management interventions – including time blocking – reported improved job performance, lower stress levels, and greater satisfaction with their work. Similarly, Therese Macan found that perceived control over time was positively associated with both job satisfaction and reduced job-induced tension.
These findings align with organisational research on autonomy and engagement. When professionals have a sense of control over their time, they are more likely to enter a state of flow – a psychological state linked with high performance and job fulfilment. Time blocking, when used strategically, facilitates this state by allowing deep work to occur in protected, uninterrupted windows.
Practical Strategies for Implementation
Getting started with time blocking requires no expensive tools or specialist software – a digital calendar or notebook will suffice. The key is to move from reactive planning to intentional scheduling. Here are a few practical steps:
- Plan and prioritize proactively. Effective time blocking begins with clear priorities. Start each week by listing key personal and professional goals, then use tools like the Eisenhower Matrix to focus on high-value tasks first. Map out your ideal week, assigning blocks based on your energy levels – e.g., mornings for strategic work, afternoons for admin, and evenings for personal time. Treat your plan like a commitment and share it with key people to protect your priorities while remaining flexible for urgent needs.
- Protect deep work blocks for strategic tasks. Deep work is essential for executive impact but easily lost in busy schedules. Block 1–3-hour chunks for uninterrupted strategic thinking, ideally during your peak energy times, and label them clearly (e.g., “CEO Vision Hour”) to signal their importance. Mark these sessions as "Do Not Disturb" and remove distractions. Over time, protecting these focus blocks becomes a habit that enables higher-quality thinking, problem-solving, and decision-making.
- Tame the meeting overload. Meetings consume valuable time and scatter your focus. Group them into dedicated time blocks (e.g., 2–4 PM) to minimize context switching and reclaim your mornings for deep work. Establish "No-Meeting" windows and push for concise, purpose-driven meetings. Delegate scheduling, use calendar tools to control availability, and block buffer time between sessions. The goal: meetings fit into your plan, not the other way around.
- Batch routine tasks to reduce context switching. Routine tasks like email and approvals are best handled in batches. Schedule specific windows (e.g., 11:30 AM and 4 PM) to process these efficiently and avoid constant mental gear-shifting. Grouping similar low-focus tasks into one time block helps maintain concentration for more strategic work. You can also theme certain days or half-days (e.g., “Admin Fridays”) to streamline responsibilities and reduce fatigue from frequent task-switching.
- Preserve your decision-making energy. Executive roles demand constant decisions, so protect your mental energy. Schedule important decisions during peak alertness (often mornings) and delegate or automate minor ones. Use routines to reduce trivial choices, and pre-plan your day to avoid decision fatigue. Include scheduled breaks and set daily cutoffs to recharge, helping you stay sharp and avoid burnout over time.
- Balance personal and professional responsibilities. True balance requires planning for your personal life as deliberately as your work. Block time for family, health, hobbies, and rest – then honour those blocks as you would a board meeting. Communicate boundaries to your team, and use recurring calendar events or out-of-office settings to reinforce them. This protects your well-being, boosts productivity, and models healthy behavior for your organization.
Beyond the Office: Time Blocking and Life Design
Time blocking’s value extends beyond workplace productivity. By deliberately scheduling non-work activities – from walking to time for lunch preparation and mindful eating – professionals can create more sustainable and balanced routines.
In a world where the boundaries between work and life continue to blur, consciously carving out time for rest, relationships, and recovery is not a luxury – it is essential for long-term success. Studies in occupational health psychology consistently show that recovery experiences such as psychological detachment, relaxation, and mastery are key predictors of well-being and performance.
Making every hour count
The modern professional landscape rewards those who can manage their time, not merely fill it. In this context, time blocking offers a structured, evidence-based approach to reclaiming focus and aligning daily actions with broader goals. Like good nutrition and regular movement, it is a habit that pays compounding dividends.
To borrow the words of Peter Drucker, “There is nothing so useless as doing efficiently that which should not be done at all.” Time blocking ensures that the right things are done – with purpose, clarity, and intention.
Professor Emeritus Simon Jobson and Dr Dominic Irvine