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How many tasks should you plan in a day?

For most people, three to five real tasks a day is a good place to start. Your own number is better, and you don’t have to guess it: two weeks of counting what you actually finish will tell you. The harder part comes later, on the afternoon when a full list asks for one more.

By the designer who makes Morrow · 17 October 2026 · Updated 18 October 2026 · 6 min read

Why do we plan too much?

Mostly because we’re bad at guessing how long things take, and we tend to be wrong in the same direction: too short. Psychologists call this the planning fallacy.

In a well-known study, students writing their thesis were asked how long it would take them. On average they guessed about 34 days. It took them about 56. Even their worst-case guess, about 49 days, was too short.¹

A single day goes the same way, only faster. Each task looks like it fits when you read it on its own. Then a call runs over, someone needs a quick answer, lunch is late, and by the middle of the afternoon the list is a record of what you hoped for. Twelve things for one day is closer to a wish than to a plan.

It’s also why, when I gave cards in Morrow a size, I kept the sizes rough: a quarter of an hour, half an hour, an hour, two hours, half a day. To me, “about an hour” is a size you can be honest about, and “fifty minutes” is a promise. The thesis students show how promises about time tend to go. The size is always your own guess, too. Morrow doesn’t let an AI decide how long your work will take.

Is there a perfect number?

No. You’ll often read “three tasks a day” or the “1-3-5 rule”. Those are rules of thumb, not research results. They help because they’re small, not because the exact number suits everyone.

The size and the kind of task matter more than the count. Three deep tasks can fill a whole day, while ten small ones can fit in an afternoon. A good list for one day mixes a few things that move something important with a few small ones you can finish in between.

That’s one of the reasons Morrow has no points and no streaks. A limit on how much you take on is useful. A score for how many tasks you finish is something else. A task isn’t a unit of value, so a score like that quietly rewards splitting one real piece of work into six small ones. The number goes up, and the day gets no better.

Start with three to five

If you’ve never set a limit, try this shape:

• One to three tasks that matter. The ones that move a project forward, or that you’d be glad to have done by tonight.
• One or two small ones. A reply, a booking, a quick fix.
• Nothing else on today. Everything else waits on your full list.

Five makes a good ceiling to begin with. It’s enough for real work and small enough to finish on most days, and finishing your list feels very different from finishing half of it, even when the work is the same. Five is also where Morrow starts, and only where it starts: the number is yours to change.

Find your own number in two weeks

A limit holds up when it’s based on what you actually do, not on what you hope to do.

1. For two weeks, plan your days the way you normally would.
2. Every evening, write down how many tasks you finished. Only the finished ones.
3. Leave out the days you didn’t work at all. A day off isn’t a small day.
4. After two weeks, look at the middle number. Not your best day, and not your worst.
5. Use that as your daily limit. On a light day you can always add one more.

The middle number is honest, because it already includes your meetings, the interruptions and the days that went sideways. Your best day makes a poor target, because the only way to beat a record is to have an unusual day.

What about days full of meetings?

Count your meetings before you choose your tasks. Five hours of meetings isn’t a normal day with less time in it. It’s a different kind of day. Plan one or two small tasks, and be pleased when you finish them.

It helps to see both in one place. With your tasks on one screen and your calendar on another, it’s very easy to plan the list as if the calendar weren’t there.

When today is full and something new comes in

A limit is easy to keep at nine in the morning. It gets tested in the afternoon, when a request arrives that will only take “a moment”. I’d treat that as a swap, not an addition. Either something comes off today, or you raise the limit on purpose and know that you did. What doesn’t work is the list that grows by one without anyone deciding, then by one more, until it’s the twelve-item wish again.

What to do with everything that doesn’t fit

This is where a lot of systems go wrong. If the rest of your tasks have no safe place, you’ll try to squeeze them into today, because you’re afraid you’ll forget them.

So keep one full list, grouped by project, where everything lives. Today is a small choice from it. Not doing something today isn’t the same as forgetting it: it stays on the list, and you can choose it tomorrow. If that list doesn’t exist yet, a brain dump is a quick way to fill it the first time.

There’s a focus reason as well, beyond time. Every extra task in view is one more goal pulling at your attention. Researchers call the way the mind keeps other goals quiet goal shielding, and a short list for today makes that much easier.