--- title: "Screen time wrong or too high: how the iPhone counts, and the 24-hour bug · finit" description: "Why Screen Time looks too high, why totals shift, and what the 24-hour day really is: how the iPhone counts, what merging devices does, and the one real glitch with its fix." url: https://getfinit.com/fr/blog/screen-time-wrong lang: fr published: 2026-05-28 modified: 2026-05-28 --- # Why your Screen Time looks wrong, and what to do about it 28 May 2026 · 4 min read · by the makers of finit You check the number, and it can't be right: too high for a day you barely touched the phone, a total that doesn't match what you remember, sometimes a bar claiming a full 24 hours. Before you distrust the whole feature, it helps to know how Screen Time actually counts, because most wrong-looking numbers are one of five explainable things, and only one of them is a real malfunction. ## How Screen Time counts Screen Time counts an app whenever the screen is on and that app is in front. That simple rule produces most of the surprises: the phone lying on the desk with a navigation app open counts every minute; a video playing while you cook counts; reading one article for forty minutes counts exactly like frantic scrolling for forty minutes. The number measures screen-on time, not attention, and days feel shorter in memory than they were on the glass. ## Your other devices are in the total If **Share Across Devices** is on, the headline number is the sum of every device signed into your Apple Account: iPhone, iPad, and Mac. An afternoon of work in Safari on the Mac lands in the same total as your phone use, which is the most common reason a number looks impossibly high. Tap into the chart and check the device list; you can read each device separately there. If the merge itself behaves strangely, [merged devices are also a classic cause of history looking rewritten](https://getfinit.com/fr/blog/screen-time-disappeared). ## Today hasn't settled yet Apple smooths the current day's numbers while it is still in progress, and devices sync their counts with a delay. Today's total can visibly shift, sometimes downward, as the day is reconciled. A number that looks off at 3 p.m. is often correct by tomorrow morning; judge finished days, not the one still running. ## The 24-hour day A day showing at or near 24 hours of use is not you; it is the counter misfiring, a long-standing glitch where an app's session never closes in the log, often after a crash, a stuck background state, or a device transfer. There is no setting that repairs a broken past day. What usually stops it from continuing: restart the iPhone, and if a specific app keeps producing impossible numbers, update or reinstall that app. The broken day stays wrong in the record, which is its own argument for [keeping your own copy of the honest days](https://getfinit.com/fr/blog/export-screen-time-data). ## Checking the number against reality Open **Settings → Screen Time → See All App & Website Activity** and switch to Day view. Tap through the individual apps and look at the sessions: the pattern usually explains the total. Long unbroken blocks point at a screen left on; a device you forgot about points at the merge; a full-length block from midnight to midnight points at the counting bug above. And remember the window while you audit: [the iPhone only keeps about four weeks of this detail](https://getfinit.com/fr/blog/screen-time-history), so a suspicious pattern you want to watch needs a record that outlives it. ## Les réponses courtes ### Why is my screen time so high? Usually because the count is honest and memory is not: screen-on time includes navigation, video, reading and idle screens, not just scrolling. The other common reason is Share Across Devices, which folds your iPad and Mac into the same headline number. ### Why does my Screen Time show 24 hours? That is a known counting glitch, not real use: an app session failed to close in the log, so it counted all day. Restarting the iPhone and updating the app that shows the impossible block usually stops it from happening again. The already-recorded day cannot be corrected. ### Is iPhone Screen Time accurate? Broadly yes, with honest edges: it measures any time the screen is on with an app in front, it smooths the current day while syncing, and totals can include your other Apple devices. Third-party trackers that read the same data can differ slightly from the Settings display for the same reasons. ### Why is the total different on each device? With Share Across Devices on, each device shows the combined total once it has synced, and syncing lags by minutes to hours. With it off, every device only counts itself. A mismatch right after using one device heavily is normally just the delay. A number you distrust gets ignored, and an ignored number changes nothing. If you want the honest version, day by day, kept where a broken week can't quietly rewrite it, [that's the record finit keeps](https://getfinit.com/fr/why). [Télécharger dans l'App Store](https://apps.apple.com/us/app/finit-screen-time-life/id6786888937?pt=128650426&ct=web-agent&mt=8) [Le voir dans l'app →](https://getfinit.com/fr/#app) --- Markdown twin of https://getfinit.com/fr/blog/screen-time-wrong. Site map for agents: https://getfinit.com/llms.txt. Every English page in one file: https://getfinit.com/llms-full.txt. The same page in another language: the same path with a language segment in front, https://getfinit.com/de/blog/screen-time-wrong.md for one; the list is in llms.txt.