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# AVAssetDurationDidChangeNotification

A notification the system posts when a fragmented asset minder observes a change to a fragmented asset’s duration.

```
extern NSString * const AVAssetDurationDidChangeNotification;
```

## Discussion

The system posts this notification only for changes that occur after an asset’s [`duration`](/documentation/AVFoundation/AVAsset/duration) property reaches a [`AVKeyValueStatus.loaded`](/documentation/AVFoundation/AVKeyValueStatus/loaded) status.

---

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