---
title: duration
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avmutablemetadataitem/duration
---

# duration

The duration of a mutable metadata item.

## Declaration

```swift
var duration: CMTime { get set }
```

## See Also

### Accessing timing

- [time](avfoundation/avmutablemetadataitem/time.md)
- [startDate](avfoundation/avmutablemetadataitem/startdate.md)