As an individual contributor, my inbox and chat messages were manageable. Tackling them as they arrived felt productive, and context, switching away from deep work was a welcome mental break.
Moving into management changed everything.
With direct reports, broader responsibilities, and an expanding network, communication turned into a continuous flood. My instinct was to lead by example and be fully accessible, answering every message and thread immediately.
The result was a classic trap. Important strategic tasks got pushed later into the day until they weren’t getting done at all. My fallback was working late into the evening when it was quiet, which quickly eroded my personal life and personal admin.
The turnaround required two things: shifting my mindset around availability, and implementing strict time-boxing, dividing the day into dedicated blocks for Email, Meetings, Team Support, Deep Work, and essential buffer time.
Human cognitive capacity is finite. Research on context-switching demonstrates that every interruption carries a heavy recovery cost, taking an average of over 20 minutes to regain deep focus on the original task (Mark et al., 2008). Furthermore, continuously juggling unstructured inputs rapidly exhausts working memory and executive function (Sweller, 1988).
Trying to be everywhere at once doesn’t make you a responsive leader, it creates a bottleneck and triggers decision fatigue.
By applying Parkinson’s Law, the principle that work expands to fill the time allotted to it—time-boxing creates firm structural boundaries (Parkinson, 1955). It protects high-value work, prevents reactive demands from hijacking your entire calendar, and forces you to trust your team to resolve issues without your real-time input on every thread.
Segmenting your day isn’t just a scheduling hack; it’s a fundamental leadership skill.