---
title: duration
framework: coremedia
role: symbol
role_heading: Instance Property
path: coremedia/cmtimerange/duration
---

# duration

The duration of the time range.

## Declaration

```swift
var duration: CMTime
```

## See Also

### Inspecting Time Ranges

- [start](coremedia/cmtimerange/start.md)
- [end](coremedia/cmtimerange/end.md)
- [isValid](coremedia/cmtimerange/isvalid.md)
- [isEmpty](coremedia/cmtimerange/isempty.md)
- [isIndefinite](coremedia/cmtimerange/isindefinite.md)