Two different distances, one feeling
A meeting ten minutes away and a meeting two hours away can register as the same non-event — right up until the ten-minute one is suddenly starting and you're not ready. This isn't a planning failure in the usual sense. It's a difference in how time itself is being registered before the fact.
A meta-analysis pooling over fifty studies on ADHD and time processing found consistent, moderate deficits across several different ways of measuring time perception — estimating how long something took, reproducing a duration, judging how much time has passed. This isn't one narrow symptom. It shows up across a range of tasks, in adults as well as children.
Why short and long time behave differently
The research points to two separate mechanisms, not one. For shorter intervals, the issue looks attentional — the internal tracking that most people do automatically is less reliable. For longer, less immediate stretches of time, the issue looks more motivational: something that isn't due for hours doesn't generate the same internal sense of urgency, so it doesn't get flagged as worth acting on yet — until, abruptly, it's due now.
That's the mechanism behind the classic pattern: nothing feels urgent until everything is.
Externalizing the clock
None of this responds well to "just be more aware of the time" — awareness alone doesn't compensate for a tracking system that isn't firing reliably. What helps is putting the clock somewhere you can see it, instead of relying on an internal sense that isn't dependable:
- A visible countdown — a timer with a shrinking dial, not just a number — for anything with a hard start time.
- Alarms placed at meaningful checkpoints before the deadline, not just at the deadline itself.
- Anchoring plans to events instead of clock times where you can: "after lunch," not "at 2pm" — an anchor is harder to lose track of than a number.
The goal isn't to become someone who's naturally good at sensing time. It's to stop needing to.