There's no official screen time limit for adults. Research suggests the total matters less than what screens push out, such as sleep, exercise and time with people, and whether the time was your choice. For young children, the WHO says no screen time under age 2 and no more than 1 hour a day for ages 2 to 4.
“Is 5 hours of screen time bad?” is one of the most searched questions about phones, and the honest answer is that the hour count alone doesn't tell you much. Here's what the guidelines and the research actually say, and a better way to judge your own use.
Is there an official limit?
- Under 5: the World Health Organization recommends no sedentary screen time for children under 2, and no more than 1 hour a day for ages 2 to 4, with less being better (WHO, 2019).
- Older children and teens: the American Academy of Pediatrics doesn't set a single limit. It asks families to look at the child, the content, what screens crowd out, and to agree a family media plan.
- Adults: no official limit exists. In 2019, the UK's Chief Medical Officers found the evidence too weak to set ideal amounts even for children.
Why the number of hours isn't the whole story
Two large studies of teenagers changed how researchers think about screen time:
- Across about 355,000 adolescents in the UK and US, digital technology use explained at most 0.4% of the differences in wellbeing, about the same as regularly eating potatoes. Being bullied was linked to wellbeing more than four times as strongly (Orben & Przybylski, Nature Human Behaviour, 2019).
- In about 120,000 English 15-year-olds, moderate use wasn't linked to lower wellbeing. On weekdays, wellbeing began to dip after about 2 hours of smartphone use, 1 hour 40 minutes of video games or 3 hours 40 minutes of watching videos (Przybylski & Weinstein, Psychological Science, 2017).
A 2019 review for the UK's Royal College of Paediatrics and Child Health found essentially no evidence that screen time is directly “toxic”. The harm seems to come mainly from what it displaces: sleep, exercise, time with people and meals (Stiglic & Viner, BMJ Open, 2019).
These are averages and links, not proof. Small average effects can still hide people who are hit hard, and that may be you if your phone is costing you sleep or work.
A better test than the hour count
Ask yourself four questions about last week:
- Did screens cost you sleep?
- Did they push out exercise, friends or family?
- Did they get in the way of work or study?
- How much of the time did you choose, and how much happened without you meaning it to?
If the answers are mostly no, your hours are probably fine, whatever the total. If any are yes, that's the part to change, and it usually means one or two apps rather than the whole phone.
How much screen time do people actually have?
- Adults: internet users worldwide spend about 6 hours 38 minutes a day online (DataReportal, Digital 2025).
- Teens: about 8 hours a day of entertainment screen time in the US, not counting school, and tweens about 5 hours (Common Sense Media census, 2026).
The 3-6-9-12 rule for children
Created by French psychiatrist Serge Tisseron in 2008, and still widely used by parents:
- 3: no screens before age 3.
- 6: no personal digital device, such as a games console, before 6.
- 9: no internet, even with an adult, before 9.
- 12: no unsupervised internet before 12, and after 12, no phone in the bedroom at night.
How to reduce screen time
Cutting just the worst part can be enough. In a 2018 study of 143 university students, limiting Facebook, Instagram and Snapchat to 10 minutes each a day for three weeks reduced loneliness and depression, most of all in people who started out more depressed (Hunt et al., Journal of Social and Clinical Psychology, 2018). It was a small, short study, but it suggests trimming social apps matters more than chasing a total.
- Find your biggest app. Digital Wellbeing shows your screen time and how many times you opened each app.
- Set a limit you can't undo on the spot. In Focus, a Strict session locks chosen apps until the timer ends, and a block rule can keep them locked during set hours.
- Protect your sleep. Keep the phone out of the bedroom and block social apps from an hour before bed.
- Check again in a week. Look at the four questions above, not just the total.
For step-by-step help, read how to stop doomscrolling or how to block apps on Android.
Common questions
Is 4 hours of screen time a day okay?
For an adult it can be, especially if some of it is work, messages or calls. There's no official limit for adults. The better test is what those hours replace: if you still sleep enough, move, see people and get your work done, 4 hours isn't a problem in itself.
Is 5 hours of screen time okay?
It depends on what the 5 hours are. Five hours that include work and video calls is very different from five hours of scrolling. Adults worldwide spend an average of about 6 hours 38 minutes a day online, so 5 hours is below average. If most of it is feeds you wish you'd skipped, cut back on those first.
Is 7 hours of screen time unhealthy?
Not automatically, but 7 hours of leisure screen time a day is likely to push out sleep, exercise or time with people, which is where most of the harm seems to come from. If the 7 hours include a desk job, look at your leisure time separately.
Is 12 hours of screen time too much?
If it's mostly leisure, almost certainly. Twelve hours leaves little room for sleep, movement and people. If you work at a screen all day, the total can look high without being a problem. Check how much of it is time you chose, and protect your sleep first: keep the phone out of the bedroom at night.
What is the 3-6-9-12 rule for screen time?
A guideline for children by French psychiatrist Serge Tisseron, from 2008: no screens before age 3, no personal digital device before 6, no internet, even with an adult, before 9, and no unsupervised internet before 12. After 12, he adds: no mobile phone in the bedroom at night.
What is Gen Z's average screen time?
For US teenagers, about 8 hours a day of entertainment screen time, not counting school, according to the 2026 Common Sense Media census of 9- to 17-year-olds. Tweens average about 5 hours. Across all adult internet users worldwide, the average is about 6 hours 38 minutes online a day.
How long should a 14-year-old have screen time?
There's no fixed number. The American Academy of Pediatrics sets no single limit for older children and asks families to look at what teens do on screens and what it crowds out. Protect sleep first: no phone in the bedroom at night. In a study of 120,000 15-year-olds, wellbeing began to dip only after about 2 hours of weekday smartphone use.