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Your Brain Only Commits the Diffs
Why five years at the same job feels like a long weekend
A colleague once told me he had fifteen years of experience. His manager, in a rare moment of honesty, replied: "You have one year of experience, fifteen times."
Brutal. Also, physiologically accurate.
Here is the mechanism. Your brain does not store duration. It stores change. It works like a version control system with aggressive deduplication: if today is byte-identical to yesterday, no commit gets written. Same alarm, same commute, same standup where six people say "nothing from my end", same lunch, same evening scroll, same bed. Nothing new to encode, so nothing gets encoded. And when you later ask your memory "how long was that?", it does not count days. It counts commits.
Empty log, short history. That is time compression - and it is why a week of travel feels longer in hindsight than the four months of office routine that funded it.
Researchers have a name for the small-scale version: the oddball effect. Drop something unexpected into a stream of repetitive stimuli and the brain rates the surprise as having lasted measurably longer than the identical repeats around it. Attention spikes, uncertainty spikes, encoding spikes. The stretch is on the order of tens of milliseconds in lab conditions - tiny, but it proves the machinery exists. Scale it up to weeks and you get the reason your thirties evaporated.
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