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# CGDisplayFadeInterval

The duration in seconds of a fade operation or a fade hardware reservation.

```
typealias CGDisplayFadeInterval = Float
```

## Discussion

Quartz uses this data type to specify the duration of both fade-out and fade-in operations. Values may range from 0 to `kCGMaxDisplayReservationInterval` seconds. A 0 value means fade immediately—see [`CGDisplayFade(_:_:_:_:_:_:_:_:)`](/documentation/CoreGraphics/CGDisplayFade(_:_:_:_:_:_:_:_:)).

---

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