Why Some People Never Get an Uninterrupted Hour

There is usually one desk in the office that people walk to. The person sitting there knows where the signed contract was filed, which customer is on stop, how to reverse a wrongly captured invoice and who approved the last price change. They are generous with that knowledge. They are also, for that reason, almost never left alone.

A colleague leans in with a quick question. A message arrives asking the same thing in writing. A call comes through because the caller was told to speak to them. Each interruption is short and reasonable. Taken together, they mean that this person rarely gets an hour in which they can think about one thing from beginning to end.

This piece explores why interruptions concentrate on particular people, what that takes from them, and what might spread the load. The argument is a hypothesis, supported by research on interrupted work and by the design of common workplace tools rather than by a study of any specific business.

Interruptions are not evenly shared

Discussions of interruption often treat it as a general condition of modern work. Microsoft's analysis of what it calls the infinite workday, based on aggregated signals from its own software, reported that people were interrupted roughly every two minutes during core hours by a meeting, email or notification. Those figures describe Microsoft's users globally rather than South African workplaces, and they are averages.

Averages hide an important pattern. In most teams, some people receive far more interruptions than others. The interruptions follow knowledge and access: the person who knows the answer, holds the password or understands the workaround becomes the place where questions go. That person's day is shaped by everyone else's needs in a way that their colleagues' days are not.

Mellorca has written about the structural side of this in how to know whether your business depends too much on one person. The focus here is on what it is like to be that person during an ordinary working day.

What interruptions cost, according to research

A frequently cited experiment by Gloria Mark and colleagues at the University of California, Irvine and Humboldt University in Berlin examined what happens when people are interrupted while working on a task. Surprisingly, interrupted participants completed their tasks in less time, with no difference in quality. But the researchers found that this came at a price: participants reported more stress, higher frustration, more time pressure and more effort.

The study was a controlled experiment rather than an observation of real offices, and it involved a specific kind of task. But its central finding is useful for this story. People who are frequently interrupted may keep their work on track by pushing harder, so the cost does not appear in output. It appears in how the work feels to the person doing it.

An illustrative day

Consider an illustrative case: the senior bookkeeper at a South African property management company with about thirty staff. They have been with the business for nine years and know the accounting system, the bank arrangements and the history of most tenant accounts.

Property managers ask them to check whether a tenant has paid, because the property system does not show payments.
Reception transfers calls about statements to them, because nobody else can explain the older entries.
Newer colleagues ask how to process unusual transactions, because the procedures exist only in the bookkeeper's memory.
The owner messages them for figures, because they can produce them quickest.

Their own work, such as month-end reconciliations and reviewing arrears, needs sustained attention. It tends to happen early in the morning before others arrive, or after they leave. Nobody asked for this. It is simply the shape the work has taken. The broader pattern is described in why customer service becomes a human search engine.

The human tax: attention and autonomy

The attention tax is the obvious one. Work that needs a long run of concentration keeps being broken, and each return to it costs some effort.

The autonomy tax is less obvious and perhaps more important. The interrupted person has little control over when they are available. Their day is organised around other people's questions. They may be the most knowledgeable person in the office and also the one with the least say over how their own hours are spent.

It would be wrong to assume everyone in this position resents it. Some people value being the one others rely on, and find the variety energising. Mellorca cannot know how any individual feels. The narrower claim is that the position removes choice: the person cannot easily decide to have an uninterrupted hour, even when their work needs one.

What could realistically change

The goal is to move some of the questions away from the person, and to give the person some control over when the remaining ones arrive.

Put the common answers somewhere else. If property managers keep asking whether tenants have paid, the property system may need to show payment status. Each repeated question points to information that could live in a system.
Write down the unusual procedures. A short guide for the ten transactions newer colleagues ask about most turns repeated explanations into a reference.
Route questions through a shared channel. Questions sent to a shared place can be answered by whoever knows, and answers can be found again later, rather than every question going to one person's desk.
Agree on availability. The World Health Organization and International Labour Organization, in their guidance on telework and health, recommend agreeing a common system for signalling availability and making sure managers and colleagues respect it. A visible status, or agreed quiet hours, only works if the team honours it.
Use tools that protect focus. Microsoft's support documentation describes a focus plan that books daily focus time in the calendar, up to four hours a day, and can mute chats and silence notifications during that time. Similar features exist in other tools. They help only alongside the steps above; muting notifications does not stop a colleague walking to the desk.

The situation also connects to authority. Some interruptions exist because nobody else may decide, as discussed in when staff need to ask who approves what.

What changes first, and the business outcome

The first change is that some questions stop arriving, because their answers are now available elsewhere. The remaining ones arrive at more predictable times.

For the business, knowledge becomes less concentrated in one person, which reduces risk when they are absent or leave. Their own work, often among the most important in the business, gets done during working hours and with fewer errors from rushed concentration.

The human dividend

The dividends are attention and autonomy. Attention, because there are stretches of the day in which one thing can be thought through from start to finish. Autonomy, because the person regains some say over when they are available, instead of their day being assembled from other people's needs.

The person may still choose to be the helpful one. The difference is that helping becomes a choice they can make rather than a condition of where they sit.

The trade-offs

Colleagues may wait longer. When quiet hours are protected, a question that would have been answered in a minute may wait an hour.
Documentation takes time to create. The person whose knowledge is being written down is usually the one who must write it, which adds to their load at first.
Some people value being central. Spreading knowledge can feel like a loss of standing, and that deserves acknowledgement.
Status signals can be ignored. Without team agreement, a do-not-disturb setting changes little.

Why it matters

The people who never get an uninterrupted hour are often the ones a business depends on most. Their knowledge makes them indispensable, and their indispensability makes them interruptible.

Mellorca's interpretation is that this concentration is usually a systems problem rather than a personality trait: information that lives in one head, questions with nowhere else to go and availability that nobody has agreed. Spreading the questions and giving the person some control over their time returns something that is easy to overlook until it is gone: an hour that belongs to them.

Sources and further reading

https://ics.uci.edu/~gmark/chi08-mark.pdf (last verified 10 October 2026)
https://www.microsoft.com/en-us/worklab/work-trend-index/breaking-down-infinite-workday (last verified 10 October 2026)
Crucial changes needed to protect workers’ health while teleworking (last verified 10 October 2026)
Focus plan for Viva Insights - Microsoft Support (last verified 10 October 2026)