How to read your result
Do it three times before reading anything into it. A consistent miss in one direction is more interesting than a single big one. Estimating short intervals and estimating how long a task will take are related but different skills, so treat this as a starting point.
The same check for real tasks
The version that changes your planning is guess-then-check: write down how long you think a task will take, then compare with how long it took. Our article on using an app for time blindness covers ways to make time visible.
The checking half is easier with a record. Dayflow is a free Mac app that keeps an automatic timeline of your screen, so the "how long did it take" number is there without a timer. It is a general tool, not a treatment, and Dayflow publishes this page.
Frequently asked questions
Is this a test for ADHD or time blindness?
No. It is a short exercise that shows how your sense of a minute or two compares with a clock right now. It cannot diagnose anything. If you are worried about attention or time perception, a doctor or licensed clinician is the right person to ask.
How does it work?
You pick a target, press start, and press stop when you feel that much time has passed, without counting or looking at a clock. The page then shows how far off you were and in which direction.
What does it mean if I stop early or late?
Stopping early means the interval felt longer to you than it was; stopping late means it felt shorter. One result says little. Try it a few times, at different times of day, and look for a consistent direction.
Is anything recorded?
No. The timer runs in your browser and nothing is stored or sent.