How Much Screen Time Is Too Much? What Research Says

Why the question has no clean answer

It would be convenient if researchers could say “two hours is fine, four is trouble.” They cannot, for a few reasons.

First, “screen time” lumps together things that have little in common. Video calling your grandmother, writing a report, binge-watching a series and watching a feed for the fortieth minute all count as screen time. Second, most studies measure the amount of use and then look for patterns. They rarely show that the screens caused anything. And third, people differ. The same hour that leaves one person relaxed leaves another feeling drained.

So rather than asking what the safe dose is, ask something more answerable: what is this costing me, and is it worth it?

What the big studies actually found

Twenge and Campbell (2018) analyzed a large survey of children and adolescents and found that heavier screen users had lower psychological well-being. It was a correlational study, so it cannot tell us whether screens lowered well-being, whether lower well-being led to more screen use, or whether something else explains both.

Orben and Przybylski (2019) looked at large datasets of adolescents and tested many ways of analyzing the same question. They found that the association between technology use and well-being was negative but very small. The takeaway is not “screens are harmless,” and it is not “screens are a crisis.” It is that total time, taken alone, explains only a sliver of how people feel.

Both of these studies are about young people, so apply them to adults with care. But they illustrate the broader lesson: the headline number hides more than it reveals.

Amount versus use

If hours are a blunt tool, what else should you look at? Several things are worth checking.

• What it displaces. The cost of screen time is often the thing it pushes out. Hale and Guan (2015) reviewed studies of children and adolescents and found that most linked more screen use with later bedtimes and shorter sleep. Time is zero-sum, and sleep, movement and in-person time are the usual losers. The World Health Organization’s guidelines (Bull et al., 2020) recommend that adults reduce sedentary time and get regular physical activity, so hours spent sitting with a device compete with that.
• Active versus passive use. Messaging a friend and watching a stranger’s video are different experiences, even if both appear in your report. A good rule of thumb is to notice whether you finish a session feeling connected or depleted.
• Whether you chose it. Intentional use (“I’m going to watch this show”) feels different from drift (“how is it 12:30?”). Feeds are designed to blur that line, which we explain in Why You Can’t Stop Scrolling.
• How it feels afterward. You are the best instrument available. If you consistently feel worse after a particular app, that is information.

None of this is a diagnosis tool. If your phone use feels out of your control or is affecting your mood, a doctor or mental health professional is the right person to talk to.

Does cutting back help?

Some experimental evidence suggests that reducing use can help, though effects are modest. Hunt and colleagues (2018) had students limit social media to about 30 minutes a day for three weeks. Compared with a control group, they reported lower loneliness and depression. The sample was small, so it is suggestive, not definitive.

Allcott and colleagues (2020) paid people to deactivate Facebook for four weeks. They found a small increase in subjective well-being. Again the word is modest: this is not a cure-all, but the direction is consistent with the idea that some of our use is more habit than benefit.

How to set a personal limit

Rather than hunting for a universal number, build your own. Here is a method that tends to work.

1. Measure first. Check your phone’s built-in screen time report for a typical week. Write down total time and the three apps that take the most.
2. Sort the apps. Put each into one of three buckets: useful (maps, banking, calls), enjoyed (a show you chose, a game you love), and regretted (the ones you open without deciding to). Your limit belongs on the third bucket.
3. Pick a modest target. Aim to trim the regretted bucket by perhaps a quarter, not to zero. Big promises collapse on the first bad day.
4. Write an if-then plan. Gollwitzer (1999) reviewed research showing that simple “if X, then Y” plans can help people follow through on their goals. For example: “If I’m waiting in line, I read a chapter instead of opening the feed.”
5. Give it time. Lally and colleagues (2010) studied habit formation outside the lab and found that the time it took to become automatic varied a lot between people and behaviors. Expect weeks, and expect a few missed days.
6. Review monthly. Adjust the target based on how you feel, not on guilt.

Why a limit alone often fails

A limit that you can dismiss with one tap is a suggestion. At the moment you need it, you are tired, bored or stressed, and the “ignore” button is right there. We dig into this in Why Screen Time Limits Fail.

That is the reasoning behind Doomreps. It locks the apps you pick, and to unlock them you earn minutes with movement. At home, you play a small game controlled by camera-tracked push-ups or squats: each rep flaps a pixel bird, and a score of 5 or more banks unlock minutes. Away from home, steps and workouts from Apple Health can earn up to 45 minutes a day. You spend the minutes, and the apps lock again. It is designed to turn a personal limit into something with a real stopping point. For more on the idea, see Earn Your Screen Time With Exercise, or visit the home page.

The takeaway

Ignore the hunt for the magic number. Look at what your screen time is displacing, notice how particular apps leave you feeling, and set a modest, specific limit on the ones you regret. Then make it hard to override on a tired night. For the practical next step, read How to Break the Phone Habit.

Sources

• Twenge, J. M., & Campbell, W. K. (2018). Associations between screen time and lower psychological well-being among children and adolescents. Preventive Medicine Reports, 12, 271–283.
• Orben, A., & Przybylski, A. K. (2019). The association between adolescent well-being and digital technology use. Nature Human Behaviour, 3, 173–182.
• Hale, L., & Guan, S. (2015). Screen time and sleep among school-aged children and adolescents: A systematic literature review. Sleep Medicine Reviews, 21, 50–58.
• Bull, F. C., et al. (2020). World Health Organization 2020 guidelines on physical activity and sedentary behaviour. British Journal of Sports Medicine, 54(24), 1451–1462.
• Hunt, M. G., Marx, R., Lipson, C., & Young, J. (2018). No more FOMO: Limiting social media decreases loneliness and depression. Journal of Social and Clinical Psychology, 37(10), 751–768. https://doi.org/10.1521/jscp.2018.37.10.751
• Allcott, H., Braghieri, L., Eichmeyer, S., & Gentzkow, M. (2020). The welfare effects of social media. American Economic Review, 110(3), 629–676.
• Gollwitzer, P. M. (1999). Implementation intentions: Strong effects of simple plans. American Psychologist, 54(7), 493–503.
• Lally, P., van Jaarsveld, C. H. M., Potts, H. W. W., & Wardle, J. (2010). How are habits formed: Modelling habit formation in the real world. European Journal of Social Psychology, 40(6), 998–1009. https://doi.org/10.1002/ejsp.674

This article is for general information and isn’t medical advice. If phone use is seriously affecting your life or mood, talk to a doctor or mental health professional.