Guide · When it does not land · last reviewed 20 September 2026
He Looked at It for Ninety Seconds and Walked Off
Ninety seconds is information. It is telling you something about the size of the pile, the level, whether the loop closes, whether somebody was watching, or how the thing was put out, and every one of those sits on your side of the table and takes under a minute to change. It is not telling you anything about how long your child can concentrate, because the same child will sit at the next thing for twenty minutes. Below are the causes in roughly the order they turn out to be the answer, each with the one thing to change.
There was not enough of it
This is the commonest answer by a distance, and it is the easiest to miss, because a tray that looks generous to an adult can hold about ninety seconds of work.
The arithmetic is blunt. Eight discs is eight posts. Ten pegs is ten squeezes. Nine holes is nine decisions. A two year old who does all nine holes on Peg and Hole Matching and leaves has completed the activity, on time, and the only thing wrong is that the activity was ninety seconds long.
The change: put out three times as much of exactly the same thing. Thirty pegs instead of ten on Clothespin Pinching. Twenty lids instead of eight on Posting and Slotting, and a tub of lids collected off the windowsill over a fortnight runs about four times as long as a handful does. A bigger board for the pegs, punched in two minutes with a pencil.
One caution, because it goes the other way for liquids and anything else that gets used up in one go. On Water Pouring and Transfer, a full jug is one pour and the game is over; a third of a cup is ten pours. It is the number of repetitions that matters, not the amount of material.
It was pitched one rung off
Too easy and too hard both end in a child leaving the table, which is why they get confused, and the fixes are opposite. The ninety seconds themselves tell you which.
If the work was done in those ninety seconds, correctly and fast, it was too easy. On Color Shade Grading we put it this way: the set is below his level, which is good news about him and bad news about the set. Add a step. Seven shades instead of five, or two colours shuffled together so they have to be sorted before they can be graded.
If the hands stopped in those ninety seconds, or asked for you, it was a rung too high. On Story Sequence Cards a child who gets the two ends right and abandons the middle is telling you that four cards is one more than today can hold. Take the middle card out and run it as three.
The change: move one variable, not three, and move it on the material rather than on the child. Too Easy, Too Hard, or Just Right is the longer version of this, and every activity page here carries a four-rung ladder with the signal to look for written on each rung.
The loop had no end to it
Some activities are ninety seconds long because nothing came back. The child did the thing, the thing disappeared, and there was no reason to do a second one.
Posting and Slotting is the pure case. He posts one disc into a sealed tub and wanders off, and he is not bored, he is finished: the discs went in and never came back. Take the lid off and tip them out in front of him once. Most children then go round the loop five or six times, and the activity that was ninety seconds is now ten minutes.
The same thing happens without a lid. On Clothespin Pinching, a peg squeezed onto the rim of a bowl gives nothing back, so there is no reason to do the next one. Clip a string between two chairs and hang a sock on it, and the squeeze suddenly holds something up.
The change: make the result visible and make it reversible. A finish line helps as much as a restart does: on Tweezer Transfer Challenge we stop when the saucer is empty rather than when the carton is full, because an empty saucer is an ending a three year old can see coming from six chickpeas away.
Somebody was watching
This one is invisible from where you are sitting, which is the problem with it. On the water pouring page, the commonest cause of a thirty-second run is not the water at all. It is that an adult was sitting close enough to be watched.
Every adult does this. Watching is what interest looks like from the inside, and setting something up and then not seeing how it goes is genuinely hard. But a child who can feel an adult's attention on their face is working on two things at once, and one of them is you.
Speaking into a run ends it faster still, and praise does it about as reliably as a correction, because both move the attention off the work and onto the adult. The most useful thing to do during a good run is nothing at all.
The change: move back a metre, sit down with something of your own, and stop watching her face. The other version of this is to join instead of observe. On Walking the Line, mostly you walk it yourself: a two year old joins a line that is already being walked far more readily than one she is invited onto.
It was offered rather than left out
An activity handed over by an adult starts with a small debt attached to it. An activity found on a shelf, already set up, starts with none. The difference in how long a child stays is much larger than it has any right to be.
The line we use on Tweezer Transfer Challenge is the shortest way to say it: a set tray gets started on its own, a box of parts gets asked about. The same is true of Peg and Hole Matching, left on a low shelf with the pegs standing in it, and of Clothespin Pinching, which is one of the few things here that gets picked up again without anybody suggesting it.
The change: set it out completely, at the child's height, and say nothing. Then leave the same thing out for a week rather than rotating. Four evenings on one activity builds longer runs than four different activities do, because the first five minutes are not spent working out what it is. And leave the unfinished work where it can be seen: a half-done weaving on the side and a finished map left on the table are what bring a child back, whereas a basket of pieces tidied into a cupboard does not come out again.
It was the wrong ten minutes
The cheapest variable on this page, and the one worth trying before you change anything about the activity itself, is simply when. A tray offered twenty minutes before lunch, or straight off the back of nursery, or while something better is happening in the next room, is competing rather than being chosen.
This is not a scheduling problem to solve. It is a reason not to draw a conclusion from one outing. Several things in this library take three or four appearances before they start, and the first ninety-second visit is part of how a child works out what the thing is.
The change: put it out again on a different day and do not introduce it. If it is still ninety seconds on the third day, then start on the pile size and the level, in that order.
Sometimes ninety seconds is the whole activity
Not everything here is meant to run long, and a short thing finished is a finished thing.
Mirror Emotion Copying runs one to three minutes at two, and that is its full size rather than a poor showing. Three-Step Instruction Hunt at three is two to four minutes across three or four rounds, and the rounds are short because a list held in mind is hard, not because the child gave up. Straw Blow Ping Pong Race works best as four minutes on the way to something else, which is exactly why it comes back the next day.
Five Minutes or Less is the shelf sorted for this, and nothing on it is a lesser activity. Ninety seconds of real work beats twenty minutes of an adult keeping something going.
The related thing worth knowing is that the numbers most people carry around are too low. The rule that gives a child one minute per year of age is a rule of thumb with no study behind it, and the observed runs in this library are several times longer than it predicts at every age. What that is worth is in How Long Should a Child This Age Concentrate For?
What to do tonight
- Put out three times as much of the same material. Nothing else changed.
- Check the ladder on the activity page and move exactly one rung, in whichever direction the ninety seconds pointed.
- Make sure the pieces can come back: lid off, tipped out, a place for the finished thing.
- Set it out at child height, complete, and walk away. Do not introduce it.
- Try it on three separate days before forming a view.
Every item on that list is a change to an object or to a room. That is deliberate, and it is the whole design of this library: when something does not land, the thing to adjust is the work, because the work is the part you can pick up and alter. A child who walks off after ninety seconds has read the task correctly and acted on it, which is a good sign about them and a piece of free information about the tray.