Three Questions for the Clock

Take two people into a room and give them the same task. They will sort a collection of cards according to a rule. Before they begin, tell one person that afterward you will ask how long the task lasted. Tell the other only about the cards.

When the task ends, ask both people to estimate its duration.

The clock can show the same interval for each. Yet you have not asked them to undergo quite the same experience. One had reason to keep an eye on time, at least mentally. The other discovered the timing question only after the interval was gone.

Researchers use a basic distinction like this one. A prospective duration task tells a person in advance that a time judgment will be required. A retrospective task asks afterward, without that advance warning. In both cases the answer may come after the task. The difference lies in what the person knew while doing it.¹

That last detail can be easy to miss. Prospective does not simply mean living in the present, and retrospective does not simply mean thinking about childhood. They describe a procedure. If we treat them as names for two entire modes of human existence, we will ask the findings to do far more than the experiments did.

Imagine the practical effect of the warning. You may silently count, watch for changes, or repeatedly wonder whether enough time has passed. You may try to do none of these things and still find the question waiting in the background. Meanwhile, the person who received no warning can give more thought to sorting correctly. Later, that person may use the remembered activity to work out how long it probably took.

Both people used attention. Both will use memory to answer. The warning changes how those resources may be directed. It does not divide the mind into a timing half and a remembering half.

In their 1997 review of twenty experiments, Richard Block and Dan Zakay found that estimates were generally longer and less variable when people had known a time judgment was coming. The size of the difference depended on features of the task. Their account gave attention a central role in prospective judgments and memory a central role in retrospective ones.¹

Length and speed are different answers

Now ask the person a second question: did time seem to pass slowly or quickly?

The first answer might be “about twenty minutes.” The second might be “very quickly.” There is no conflict. A person can recognize that a conversation lasted a long time and still feel that it flew by. You have done this whenever you looked at a clock after an absorbing visit and said, “Have we really been here that long?”

A duration estimate concerns the length of an interval. A passage-of-time judgment concerns its felt pace. The phrases sound nearly interchangeable in ordinary speech. Research has to keep them apart because one can change without the other changing in the same way.

Droit-Volet and Wearden’s smartphone study, introduced in the previous chapter, makes this distinction concrete. Along with reports about everyday time’s passage, participants estimated brief sounds or produced specified short intervals. The researchers found no significant relation between the everyday passage ratings and those duration measures.² The two questions cannot simply stand in for one another.

In fact, later work by Droit-Volet and colleagues found a relationship under longer timing conditions of several minutes.³ That is what a serious distinction should allow: sometimes two measures travel together, sometimes they do not, and the conditions help explain which result appears.

Suppose you tell me that a meeting dragged. I reply, “It lasted only twenty minutes.” My answer may be correct and still fail to address your complaint. You were describing the experience of being there. I offered a measurement of its length.

Suppose instead you tell me that you need to leave after twenty minutes. I reply, “Don’t worry, the meeting will fly by.” Now I have failed in the other direction. Enjoyment does not make you punctual.

These are small comic failures, but versions of them appear throughout advice about time. Someone has too few free hours and receives advice about perception. Someone feels unable to recall a year and receives advice about getting more done. Someone is lonely during slow evenings and is told that slow time is a gift.

We cannot choose a good response until we know which question the person is trying to answer.

There is also a third question we often hide inside the first two: what can you bring back from the interval now? A person may recall a conversation in considerable detail, even though it seemed to pass quickly and even though its duration estimate is wrong. Another may know exactly how long a commute took because the schedule says so, while recalling almost nothing specific about that journey.

Recall is not a clock reading. A clock reading is not a measure of involvement. Involvement is not an inventory of memories.

A single number called “subjective time” would conceal these differences. The phrase is useful as a broad subject. It becomes dangerous when we treat it as one thing that always expands or contracts together.

One interval, several questions

Here is a simple way to keep the questions visible:

• Preparation: Did you know a duration judgment would be requested?
• Outcome: Are you estimating length, describing felt passage, or recalling what happened?
• Scale: Are you judging a brief sound, a whole afternoon, or a period of your life?

These are dimensions of a question, not kinds of people. The same person can move among them in a few minutes. You might wait for a kettle, become absorbed in a conversation, and then wonder how long it has been since the person last visited. There is no need to decide which one is your real way of experiencing time.

The comparison below keeps these questions separate. The examples are invented; they are not study results.

Scroll sideways to see all columns. Keyboard: focus the table and use the left and right arrow keys.

Dimension	One question	A different question
Preparation	Told beforehand: estimate the task's duration	Asked unexpectedly after the task
Outcome	How many minutes did it last?	Did time feel slow or fast?
Scale	How long was a brief sound?	How fast did the past decade seem?

Three questions to keep separate. An explanatory comparison, not measured data or a model that predicts anyone’s experience.

What busyness can and cannot explain

The word busy needs some care too. A difficult task can demand steady concentration. A day of short errands can demand repeated changes of focus. A person can feel busy because of what remains unfinished, even during a quiet interval. These situations are not identical.

A 2010 meta-analysis by Block, Peter Hancock and Zakay examined 117 experiments on cognitive load, meaning the mental demands of a task. Greater load tended to reduce duration estimates when participants knew a timing judgment was coming, but increase them when they were asked unexpectedly afterward. The effects also depended on the kind of load.⁴

This pattern gives us a reason to be suspicious of simple claims that busyness either shortens time or lengthens it. Before choosing a direction, we need to know what was measured and how the person’s attention was occupied.

A task may consume attention without being worthwhile. An overloaded person may struggle to follow anything well. Before asking whether busyness can alter the feeling of time, we should ask what kind of busyness we are considering.

Consider two imaginary afternoons with the same number of appointments. During one, the appointments form a satisfying sequence. You meet someone, solve a problem, and have enough space to move between them. During the other, each appointment is partly spent worrying about the next. One runs late. A message arrives about a forgotten task. By the end, you have been occupied continuously but feel that you were barely available for any of it.

If we call both afternoons equally busy and stop there, we lose the difference that matters to the person. Counting events does not tell us how those events were experienced. The practical issue may be breathing room between commitments, clarity about what can wait, or the ability to finish one thing before beginning another.

We should be especially careful with an appealing story sometimes attached to these findings: an exciting holiday goes quickly while you live it and feels long when you remember it; a dull working week goes slowly while you live it and feels short afterward.

That can describe a person’s experience. It can also miss it completely. A holiday can be tedious, frightening, hurried or hard to recall. A working week can contain deep interest and memorable conversations. The contrast is a possible pattern, not a division between two categories of life. We will examine novelty and routine more closely later. For now, keep the pattern open to what actually happened.

An explanation should make us more attentive to variation, rather than giving us a phrase with which to flatten it.

The distance from a sound to a year

Imagine testing the weight of a pebble and then announcing that you understand the strength of a mountain. Both concern rock. Something important has still been skipped.

A related jump occurs when a finding about a one-second sound is offered as the explanation for an entire decade. Brief timing tasks can teach us a great deal about perception, attention and action. They cannot by themselves establish how people judge the pace of their lives.

A second passes while a sound continues. A decade contains changes in work, relationships, health, place and identity. When asked about that decade, you may draw on broad knowledge of your life, a few particular scenes, expectations about age, and the circumstances in which the question reaches you. The answer is assembled at a very different scale.

This does not make brief experiments irrelevant. It gives them a place. They can reveal processes that deserve further testing, help distinguish competing explanations, and rule out claims that sounded obvious. The error is treating a possible contribution as a complete account.

The direction of a result may also depend on scale. Imagine that a small interruption makes a short task feel broken into pieces. That result would not tell us whether adding ten major disruptions to a year would make the year feel richer. The disruptions might be unwanted. They might interfere with remembering, or leave someone occupied with recovering. Their meaning cannot be read off the number of boundaries alone.

A reader should not need a degree in psychology to spot this problem. A few plain questions are enough. What were people doing? How long did it last? What exactly were they asked? Were the same people observed over time, or were different groups compared? Was a cause changed by the researchers, or was a relationship observed?

The questions are not obstacles placed in the way of a good idea. They are how we find out what the idea is good for.

Take an age comparison. If older participants describe the past decade as faster than younger participants do, we have a finding about those groups and that question. We have not watched each person age across a lifetime. Differences in work, family demands, historical experience or the way people interpret the question may matter. A later chapter will examine the age evidence. For now, notice how much changes when we state the design accurately.

We have gone from “science proves time speeds up as you age” to a finding that can be investigated. It is less tidy. It is also much more interesting.

How the brain does the timing

Timing helps us hear a beat, coordinate a movement and anticipate what comes next. These jobs differ. Neuroscience points to a variety of timing mechanisms across neural circuits, rather than one explanation for every scale and task. Joseph Paton and Dean Buonomano’s review describes how the changing activity of cells and networks can serve these different functions.⁵

Internal-clock models give researchers a way to make predictions. In some, pulses accumulate, attention affects what is counted, and memory helps compare an interval with previous ones. The model is useful to the extent that it explains the evidence. We can learn from it while keeping the variety of timing functions in view.

A chemical name still needs an explanation around it. Saying “dopamine” does not tell us which task was studied, what was altered, in which species, or how a result relates to remembering last year. A complicated account should not be made simple by removing the steps that would make it true.

You can understand the practical argument of this book without pretending to adjust a brain clock. You can examine attention, experience, memory and conditions of life at the level where you have some room to act. If an ordinary week contains no time with someone you miss, the first question may concern a visit, not a neurotransmitter.

Biology can deepen that account. It becomes less helpful when its language hides the ordinary problem we hoped to understand.

The brain is involved in every page you read and every meal you remember. That fact does not tell you which pages deserve your evening, or which person you want beside you at the table. Science can inform the decision. It cannot supply your entire reason for making it.

A clearer question changes the next move

Let us put the distinctions to work without turning them into another checklist you must carry all day.

A person says that their evenings take forever. Further conversation reveals that the problem is an unwanted stretch alone after work. Offering a memory exercise may miss the need for company or a more absorbing activity. The slow passage is real as an experience, even though the solution cannot be inferred from that experience alone.

Another person says that their evenings disappear. They enjoy a demanding craft, often looking up from it in surprise. They would like to keep the activity and avoid missing bedtime. An ordinary external reminder might serve them better than trying to make the work feel less engaging.

A third says that the previous month is a blur. They were caring for someone and remember the general pressure more than particular days. They may want a few concrete reminders of what happened. They may also need recognition, relief or rest. The blur should not become evidence that they failed to pay enough attention.

These examples are deliberately different. They resist a universal instruction because the people want different things from time. The language becomes more precise so the response can become more humane.

There will still be uncertainty. You will not always know why a particular week felt strange. You do not have to solve every fluctuation. We are trying to understand enough to make thoughtful choices, not to conduct a continuous experiment on our own existence.

The clock is excellent at answering how much time passed. For questions about what filled it, what reached us, and what remains available now, we need other kinds of evidence.

The next of those is memory: the past we can enter, with its missing details, unexpected doors and occasional confident mistakes.

Sources and notes