Actual play-time logs found a tiny positive link to wellbeing

The short answer

A 2021 study used actual logged play time from two video games, rather than players' own estimates, and found that more play time was weakly associated with slightly better wellbeing, not worse. The relationship was real but small, explaining only about 1% of the difference in wellbeing between players.

What the evidence says

Video game play is positively correlated with well-being, published in Royal Society Open Science on 17 February 2021 by Niklas Johannes and colleagues at the Oxford Internet Institute, combined survey responses on wellbeing, motivation and need satisfaction with telemetry, meaning company-logged play time, provided directly by Electronic Arts and Nintendo of America for players of Plants vs Zombies: Battle for Neighborville and Animal Crossing: New Horizons. For each additional ten hours played, wellbeing rose by roughly 0.02 to 0.18 of a standard deviation in the first game and 0.03 to 0.09 in the second, both small effects. The study's published analysis code confirms the sample sizes behind these figures, around 468 and 2,537 players respectively for the play-time-and-wellbeing models.

For context

The same study found that players routinely overestimated their own play time compared with the company's logs, which is the main reason this design mattered: most earlier research relying on self-reported hours may have been measuring perception as much as behaviour. A small positive association is not evidence that gaming causes wellbeing, and the effect size here is modest enough that it should not be read as reassurance that any amount of play is fine; the researchers themselves frame it as evidence against the specific fear that ordinary play time drives poor mental health, not as a case for unlimited play.

A practical next step

You could use this study as a reason to look at how a child feels during and after playing, rather than only at the clock, since the research found that need satisfaction and motivation during play were independently linked to wellbeing regardless of how long a session ran.

• Does my child seem energised or drained after a typical gaming session, separate from how long it lasted?
• Is my own estimate of how long my child plays close to what a device's own screen-time log shows?
• What is my child getting from a game, such as connection with friends or a sense of mastery, that matters alongside the hours?

Industry-academia collaborations like this one are unusual and depend on a games company agreeing to share real usage data, so this remains one study of two specific games rather than a general verdict on all gaming, but its method is a meaningful step up from self-report alone.