Visual timers for ADHD: how to use one with your to-do list

Ask someone with ADHD how long they've been on a task and you'll often get a guess that's wildly off in either direction. Twenty minutes that felt like two. Two hours that felt like twenty minutes. Time isn't a reliable sense for a lot of us. A visual timer is a way of borrowing one.

What "time blindness" means

Time blindness is the informal term for finding it hard to feel time passing and to use that feeling to guide what you do. It's not a diagnosis, but it's a very common experience with ADHD. CHADD describes it as difficulty estimating how much time has passed, how much is left, and how long a task will take. Psychology Today's overview links it to the same executive functions that make planning and starting hard.

The practical effect is that "I'll just do this for a bit" has no natural end, and "I'll start in five minutes" has no natural start. A timer supplies the edges.

What a visual timer is

A normal timer counts down and beeps. A visual timer also shows the time remaining as something you can see shrinking: a coloured wedge that gets smaller, a bar that empties, a big number you can read from across the room.

That matters because with time blindness, a number like 14:32 in a corner is easy to ignore. A big block of colour that's visibly half the size it was is much harder to. You don't have to check it. You just see it.

Physical versions exist (the disc-style ones are popular in classrooms). Plenty of apps do the same thing. And some to-do apps, including ours, build the timer into the task itself.

The one rule: one task per timer

A timer on its own doesn't do much. A timer attached to one specific task is where the effect comes from. It turns "I should be working" into "for the next twenty minutes I'm doing this".

So before you start the timer, pick the task. Not the category, not the project. One line from your list. Then:

1. Put that task where you can see it, next to the timer if possible.
2. Start the countdown.
3. Work on that task and nothing else until it ends.
4. When it ends, stop, tick the task off if it's done, and decide what's next.

Step four is the bit people skip. The end of the timer is a decision point, not a suggestion. Stopping to choose is what stops one task quietly turning into three hours of something else.

How long should it be?

Shorter than you think. The Pomodoro Technique popularised twenty-five minutes with a short break, and that's a fine default once you're going. But if the problem is starting, twenty-five minutes can feel like a commitment you'll avoid. A few rough guidelines:

• 10 minutes when you can't get started. Anyone can do ten minutes. You're allowed to stop after.
• 20 minutes for most things. Long enough to get somewhere, short enough to keep the end in sight.
• 25 minutes when you're already warmed up and want a proper stretch.

Resist longer sessions. The value of a visual timer is that the end is always visible. At sixty minutes it isn't, and you're back to relying on a sense of time you don't have.

Make the timer hard to ignore

The whole point is visibility, so set it up that way:

• Big and in colour. If it's an app, make the countdown large. If it can show the task's colour, even better. The screen itself becomes a reminder of what you're doing.
• Visible when you've drifted. If you're in a browser, a timer that shows in the tab title lets you see it even after you've wandered off to another tab. Which you will.
• An end you can hear. A chime, not just a silent change. Time blindness cuts both ways, and you'll sometimes sail straight past the end.
• A screen that stays on. Nothing kills the effect like a laptop going to sleep at minute eight.

Use the end of the timer as a reward

Something small that helps: treat the chime as a finish line, not an alarm. When it goes, you've done the thing. Tick the task off if it's complete. Get up. Make tea. Then choose the next one.

The pause between timers is where you decide, and having a clear break makes that decision a real one instead of a drift. It also means a bad session is only ever twenty minutes long. You get a fresh start every time the timer resets.

When a task doesn't fit in one timer

Most real tasks take longer than twenty-five minutes. That's fine. The timer isn't there to finish the task. It's there to make a chunk of it visible and bounded. When the chime goes and the task isn't done, you have three options: start another timer on it, star something else and come back later, or write down the next small step and stop for the day. All three are wins. The only losing move is the one where you never started.

How the OneList timer works

In OneList the timer lives on the task. Star a task to move it into the Now section at the top, then start a focus timer of 10, 20 or 25 minutes. You get a big countdown in the task's colour, the remaining time in your browser tab, a chime at the end and an optional notification. Your screen stays awake while it runs, and Space pauses it. Tick the task off and there's confetti and a "done today" count.

It's free, works in a phone browser and needs no signup to try. If you'd like time to be something you can see, pick one task and start a timer.