When people talk about "time blindness," they usually picture something like disorientation: someone who loses track of the days, can't recall what happened that morning, drifts through their schedule. That's not it. They read the wall clock correctly, they know today's date, they remember when the meeting is. It isn't those clocks that are broken. It's the ones inside.

Because time isn't only what the dial shows. It's also a feeling, as bodily as hunger or balance. Most people don't calculate how much has passed—they sense it: that they've been sitting a long while, that there's almost nothing left before the deadline, that it's time to get up. In ADHD it's precisely this sense that runs unreliably. It's measured indirectly—through tasks of interval discrimination, estimation, and reproduction—and the finding holds up: the internal clock here keeps poor time, especially over the shortest intervals. Which way the estimate lies comes out differently across studies; but that it lies is confirmed consistently.

First consequence: intervals have no felt length. A quarter of an hour and two hours weigh the same from the inside, until you glance at the dial. Hence the chronic error in estimates. Familiar: I promise the mockup by tomorrow because the work feels like a couple of hours—and there are two days in it, and this only becomes clear once those two hours are long gone and no end is in sight. It isn't optimism, and it isn't carelessness. The instrument that measures "how long will this take" is already lying before you begin.

The second consequence is heavier. If distance in time isn't felt, the future has no weight. Not that there's no future—it's perfectly well known, the date is written down—but known as a fact, not as something approaching. Barkley called this temporal myopia: what's near in time is seen sharply; what's far is blurred and exerts no pressure. Belonging here too is a well-confirmed effect—steep delay discounting: a near trifle outweighs the distant important thing, not because it was chosen, but because the distant doesn't feel real. A deadline three weeks out is an abstraction. It gains weight only when it comes right up close, and then all at once that weight is crushing: not a slope you climb in advance, but a wall you run up against.

There's only one way to live with a missing sense: replace it with instruments. Alarms, timers, deadlines placed outside the body do what the internal signal doesn't—they show time from the outside, the way eyesight shows the body its position to someone whose balance has failed. This isn't a life hack and it isn't a matter of discipline; it's a prosthesis. Without it, there's nothing to navigate by.

And so it's useless to demand "just keep an eye on the time" or "feel your deadlines." You can know the time down to the second and not feel it passing. Clocks measure time; they don't give the feeling of it back. All you can do is hang more of them around you and train yourself to look more often than you'd like.