How Long Does It Take to Update an iPhone?
Quick Answer
15–60 minutes total for download and installation. Major iOS updates take 30–60 minutes; minor updates take 15–20 minutes.
Typical Duration
Quick Answer
15–60 minutes is the typical total time to update an iPhone, combining download and installation. A minor point update (e.g., iOS 18.1.1 to 18.1.2) usually takes 15–20 minutes. A major version update (e.g., iOS 17 to iOS 18) can take 30–60 minutes or more depending on your internet speed, iPhone model, and available storage.
Update Time Breakdown
| Phase | Minor Update | Major Update |
|---|---|---|
| Download | 2–5 minutes | 5–30 minutes |
| Preparation (verification) | 1–2 minutes | 2–5 minutes |
| Installation | 10–15 minutes | 15–30 minutes |
| Restart & setup | 2–3 minutes | 5–10 minutes |
| Total | 15–20 minutes | 30–60+ minutes |
Download Time by Connection Speed
The download is often the longest part. A major iOS update is typically 2–6 GB:
| Connection Speed | 2 GB Update | 5 GB Update |
|---|---|---|
| 10 Mbps (slow Wi-Fi) | ~27 minutes | ~67 minutes |
| 25 Mbps (average Wi-Fi) | ~11 minutes | ~27 minutes |
| 50 Mbps (fast Wi-Fi) | ~5 minutes | ~13 minutes |
| 100 Mbps (very fast Wi-Fi) | ~3 minutes | ~7 minutes |
| 200+ Mbps (fiber) | ~1–2 minutes | ~3–4 minutes |
Note: Apple’s servers may throttle download speeds on release day when millions of users update simultaneously. Day-one major updates can take 2–3x longer than normal.
Storage Requirements
Your iPhone needs free space to download and unpack the update:
- Minor updates: 200 MB–1 GB of free space.
- Major updates: 3–7 GB of free space (the update file itself plus working space).
- If storage is insufficient: Go to Settings > General > iPhone Storage and offload unused apps, clear old photos/videos, or delete cached data.
If you do not have enough storage, the update will not begin. iOS will offer to temporarily remove apps to make space (they reinstall automatically afterward).
Major vs. Minor Updates
| Feature | Minor Update (e.g., 18.3.1) | Major Update (e.g., iOS 18 to 19) |
|---|---|---|
| File size | 200 MB–1 GB | 2–6 GB |
| Install time | 15–20 minutes | 30–60 minutes |
| New features | Bug fixes, security patches | Major features, UI changes |
| Risk of issues | Very low | Slightly higher (first-day bugs possible) |
| Frequency | Every 2–6 weeks | Once per year (September/October) |
What to Do Before Updating
- Back up your iPhone: Use iCloud (Settings > [Your Name] > iCloud > iCloud Backup) or connect to a Mac/PC and use Finder/iTunes. This protects your data if anything goes wrong.
- Charge to 50%+: iOS requires at least 50% battery or a connected charger to begin installation.
- Connect to Wi-Fi: Updates require a Wi-Fi connection (cellular download is available for some minor updates on iOS 17+).
- Check compatibility: Not all iPhones support the latest iOS version. Apple lists compatible devices on its iOS preview page.
- Free up storage: Ensure you have enough space before starting.
What to Do If the Update Is Stuck
If your iPhone appears frozen during an update:
- Wait at least 30 minutes: The progress bar can appear stuck while processing large amounts of data. Do not interrupt the update prematurely.
- Force restart: If truly stuck for over an hour, perform a force restart (varies by model):
- iPhone 8 and later: Press and quickly release Volume Up, then Volume Down, then press and hold the Side button until the Apple logo appears.
- Connect to a computer: If the iPhone will not boot, connect to a Mac or PC and use Finder (macOS Catalina+) or iTunes (Windows) to restore or update.
- Use Recovery Mode: As a last resort, enter Recovery Mode and restore from your backup.
Updating via Computer
If over-the-air (OTA) updating is too slow or fails, you can update via computer:
- Connect iPhone to Mac (Finder) or PC (iTunes) via USB cable.
- Select your device, click "Check for Update," then "Download and Update."
- This downloads the full firmware (faster on a wired connection) and installs it directly.
- Useful for iPhones with limited storage since the file is stored on the computer.