---
title: dwDuration
framework: Force Feedback
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 13.0+, macOS 10.2+]
path: forcefeedback/ffeffect/dwduration
---

# dwDuration

The total duration of the effect, in microseconds. If this value is FF_INFINITE, the effect has infinite duration. If an envelope has been applied to the effect, the attack is applied, followed by an infinite sustain.

## Declaration

```swift
var dwDuration: DWORD
```

## See Also

### Instance Properties

- [cAxes](forcefeedback/ffeffect/caxes.md)
- [cbTypeSpecificParams](forcefeedback/ffeffect/cbtypespecificparams.md)
- [dwFlags](forcefeedback/ffeffect/dwflags.md)
- [dwGain](forcefeedback/ffeffect/dwgain.md)
- [dwSamplePeriod](forcefeedback/ffeffect/dwsampleperiod.md)
- [dwSize](forcefeedback/ffeffect/dwsize.md)
- [dwStartDelay](forcefeedback/ffeffect/dwstartdelay.md)
- [dwTriggerButton](forcefeedback/ffeffect/dwtriggerbutton.md)
- [dwTriggerRepeatInterval](forcefeedback/ffeffect/dwtriggerrepeatinterval.md)
- [lpEnvelope](forcefeedback/ffeffect/lpenvelope.md)
- [lpvTypeSpecificParams](forcefeedback/ffeffect/lpvtypespecificparams.md)
- [rgdwAxes](forcefeedback/ffeffect/rgdwaxes.md)
- [rglDirection](forcefeedback/ffeffect/rgldirection.md)