Time blindness: why the hours disappear

What it is

Time blindness is what a lot of people with ADHD call it when time slips past without them feeling it. Ten minutes turns out to be fifty. You sit down to answer one email, look up, and the afternoon has gone.

It’s worth being straight about the name. Time blindness isn’t a medical term, and it isn’t one of the listed symptoms in the diagnostic criteria for ADHD.¹ Researchers say time perception, or timing, instead. And there’s a fair bit of research on it.

What the research says

Timing is usually tested in a lab. People are asked which of two tones lasted longer, how long a picture was on screen, or to hold a button down for a set number of seconds.

A 2022 meta-analysis pooled 55 of these studies. People with ADHD had more trouble telling very short durations apart, were more variable when estimating durations of a few seconds, and were less accurate at estimating and producing durations. The authors read that last part as a sign of a faster internal clock.² A separate meta-analysis of 27 studies in children and teenagers found they judged time less accurately and less precisely than their peers, and tended to overestimate it. The size of the difference varied with age and gender.³

A 2013 review looked wider. It found people with ADHD had difficulties in three areas: timing their movements, perceiving durations, and what the authors call temporal foresight, which covers time frames up to years. The timing differences didn’t seem to be fully explained by other things ADHD affects, like working memory.⁴

Two honest caveats. Most of these tasks measure seconds, not the hours of a real day, so the jump from the lab to your lost afternoon is a reasonable guess rather than a proven link. And these are group averages. Plenty of people with ADHD do fine on timing tasks.

Why it happens

Nobody knows for sure. One influential model, from the psychologist Russell Barkley, describes ADHD as a difficulty with inhibition, the ability to pause before acting, which then knocks on to working memory and self-regulation.⁵ A 2021 review of adults notes that Barkley suggested these executive function differences may explain the time perception differences people report.⁶

The same review describes adults with ADHD feeling that time moves faster than it does. It also finds that prospective memory, remembering to do something in the future, is affected.⁶

Put simply: if you don’t feel time passing, and holding a future event in mind takes real effort, the future doesn’t get much say in what you do now.

What it feels like

You’re “five minutes away” for twenty minutes. A job you thought would take an hour takes the day. Another you thought would take the day takes ten minutes, but you put it off for a month. You start something at nine and suddenly it’s lunch.

Then there’s waiting mode. You’ve got the dentist at 4. In theory the whole morning and afternoon are free. But you can’t start anything, because what if you get absorbed and miss it? So you hover. You check the clock. You do small things that don’t matter. At half three you realise the day has gone and all you did with it was wait.

Waiting mode isn’t something researchers have studied by that name. It’s something people with ADHD describe again and again. It makes sense, though. If you can’t trust yourself to notice the time, and remembering the thing later takes effort, the safest plan your brain can find is to do nothing else.

None of this is a character flaw. It’s what happens when the clock in your head and the clock on the wall don’t agree.

What helps

You can’t make yourself feel time. You can make time visible, so you don’t have to feel it.

• See the day to scale. When an hour takes up the space of an hour, “I’ve got loads of time” and “I’m already late” are both easier to spot.
• Let something else hold the future. Put the 4pm thing somewhere that will tell you when it’s time to leave, not just when it starts. Then your head is free to use the hours before it. The guide to using the time before the thing at 4 walks through this.
• Time things you do often. Getting ready, the walk to the station, a weekly report. Real numbers beat guesses. Then build the leaving time around them.
• Add a buffer. If you tend to run late, pad the gaps. Ten spare minutes costs less than being late.
• Make the important things loud. For the few things you really can’t miss, use an alarm that rings even on silent.

Structured therapy programmes for adults with ADHD teach this kind of thing too: time awareness, using a planner, scheduling and prioritising. In one trial, adults who did a programme like this improved more than those who had supportive therapy alone.⁷ If time is causing real problems at work or at home, your GP is a good place to start a conversation about support.