Why do four years of work feel like four months?

Why long stretches of work collapse into a blur in memory

Four years collapse into four months because your brain stores routine as a single compressed file. Daniel Kahneman called this the gap between the experiencing self and the remembering self. When days repeat, the remembering self has nothing new to file, so the period shrinks. Adding novelty, friction, and milestones makes time expand again.

I have lived stretches of my life that, looking back, feel like a single long Tuesday. Four years at a job, three years in a city, an entire phase of a relationship — when I try to recall them, I get a thumbnail, not a film. This is not a memory failure in the usual sense. It is a feature of how the brain stores experience, and once you understand the mechanism, you can stop accidentally turning your own life into a blur.

Daniel Kahneman spent a chapter of Thinking, Fast and Slow drawing the distinction between two selves we each carry around. The experiencing self lives moment to moment. It is the part of you reading this sentence right now. The remembering self does not live in time at all — it is a story-builder that constructs a narrative out of the highlights afterward and then makes most of your decisions about the future. The two selves frequently disagree. A vacation full of pleasant but uneventful days can be remembered as forgettable, while a chaotic trip with one transcendent dinner is remembered as great. Kahneman calls this the peak-end rule, paired with duration neglect: the remembering self barely registers how long something lasted.

The neuroscience behind this is cleaner than the philosophy. Scientific American reported the consensus view in 2024: the brain encodes new experiences into memory but largely ignores familiar ones, and our retrospective sense of how long a period was depends almost entirely on how many new memories were filed during it. A year of repeating commutes, the same office, the same lunch, gets compressed into one entry. A year that included a move, a new project, a trip to a country whose language you could not speak, gets dozens of entries. From the inside, both years took 365 days. From the remembering self's archive, the second year is much longer.

This is also why your childhood summers felt enormous. Almost everything was novel — the first time at a beach, the first paperback you finished, the first thunderstorm you watched from a porch. The remembering self had hundreds of entries to file per month. The same three months as an adult, spent largely on autopilot in familiar rooms with familiar people, get filed as one entry called "summer."

What I find useful about this framing is that it shifts the question from "Where did the time go?" to "What did I encode?" The complaint about lost years is really a complaint about thin memory. Brad Stulberg makes a related point in The Passion Paradox, quoting George Leonard: to learn anything significant, you have to spend most of your time on the plateau. The plateau is where mastery is built but also where memory goes flat. The work feels endless while you are doing it and instantaneous when you look back, because the days were similar enough that the brain refused to file them separately.

The practical implication is not to manufacture chaos. People who chase constant novelty for the sake of vivid memories tend to be miserable in the experiencing self, which is the one actually doing the living. The better move is to add small, deliberate textures to long stretches of repetitive work. Pick projects that change shape every quarter rather than every five years. Take routes you have not taken before. Write a paragraph at the end of each week describing one thing that was different — that single act forces the remembering self to file a new entry. Travel, even modestly, because new physical environments are unusually generative for memory encoding. And when you cannot change your circumstances, change the kind of attention you bring to them; presence itself is a form of novelty, because most routine is run by the autopilot of System 1.

I have come to think the question "Why did four years feel like four months?" is one of the most honest and most useful questions a person can ask. It tells you that your remembering self is filing fewer entries than it used to. It is a quiet warning that the next four years are about to disappear the same way unless you arrange your life so that the brain, generous and lazy as it is, has something new worth keeping.