Happiness pioneers say up to 40% of well-being is how you spend your time. The number has a shaky history

Thirteen well-being scientists got on a Zoom call earlier this year, with roughly 600 years of happiness research between them by the count in Simon Fraser University's release, to talk about what their field has learned. The paper that came out of it says the recording and transcript are not shared publicly. What is public is a tidy headline number: up to 40 percent of happiness is linked to how you choose to spend your time.

A conversation, not an experiment

The paper is titled "Reflections on the Past, Present, and Future of Well-Being Science from Several of Its Pioneers." Lara Aknin, a social psychologist at Simon Fraser University, is a co-author with Säde Stenlund of Harvard and Kelsey O'Connor of Luxembourg's national statistics institute, STATEC. The release names only those three of the 13 people on the call. It gives no methods section, no funding detail, and no account of how the conversation was coded.

Its content is closer to a seminar than a study. Having basic needs met, close relationships, meaningful work and living by your own values emerged as the central themes. Aknin said that having just one person you can count on is "extremely consequential," and that relationships are one of the most reliable predictors of happiness. Income matters, the release says, but less once basic needs are covered.

Several participants told the group they now spend more time with loved ones after going back over the evidence. That is self-reported, and the release does not say how many is "several."

Where the 10 and the 40 come from

The release attributes the two numbers to "leading models" and does not name them. They match, exactly, the best-known one: the "happiness pie" from Sonja Lyubomirsky, Kennon Sheldon and David Schkade, published in 2005 in Review of General Psychology. That model put about 50 percent of the variation in chronic happiness down to genes, 10 percent to circumstances, and up to 40 percent to volitional activities. The 2005 paper is in the new article's reference list. The full text of the new paper sits behind a paywall, so how it uses that citation could not be checked.

The pie has had a long run. A 2019 critique counted 3,086 citations for the original as of May that year, and noted its reach into self-help books, coaching and research on topics from tourism to heart disease.

What the critics found

That critique, by Nicholas Brown and Julia Rohrer in the Journal of Happiness Studies, concluded there is "little empirical evidence" for the variance split. Its objections are specific. The 40 percent is what remains after subtracting the other two slices, so any life circumstance the 10 percent estimate left out gets counted as a choice. The 10 percent traces back to older demographic surveys, one of which put the figure at under 10 percent and another at about 15 percent. And the genetic slice was stitched together from studies of different people, including toddlers, with heritability ranging from 35 to 57 percent in one of them.

Then there is the sorting problem. Exercising regularly and sticking with goals both count as volitional in the 2005 model, yet Brown and Rohrer point to evidence that the urge to be active and the tendency to persevere are partly heritable. The slices do not stay in their boxes.

The part the critics did not say

Brown and Rohrer did not argue that people cannot make themselves happier. Their abstract says that even if the pie were valid, it would not tell you whether an individual can substantially move their own long-run happiness. A variance share describes why people in a population differ from each other. It says nothing about how far you personally can move.

That is also why the new paper's softer claims hold up better than its number. Gratitude, savouring good moments and volunteering, which several of the pioneers said they practice, do not need a percentage attached. The release reports they said the habits help. It does not offer a new test.

What to take from it

This is a university press release about a conversation, and EurekAlert carries the standard notice that it is not responsible for the accuracy of releases it posts. The numbers cannot be traced from that document alone. Aknin herself says, according to the release, that the pioneers feel the field has become fractured.

So the advice survives and the arithmetic does not. Spend time on people, get your basic needs covered, find work that fits your values. Just do not repeat that 40 percent of your happiness is a matter of choice as though a measurement stands behind it.