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# particleLifeSpan

The duration, in seconds, for which each particle is rendered before being removed from the scene. Animatable.

```
var particleLifeSpan: CGFloat { get set }
```

## Discussion

After each particle is spawned, it appears in the scene for a period of this duration before being removed from the scene. You can randomize the life spans of newly spawned particles with the [`particleLifeSpanVariation`](/documentation/SceneKit/SCNParticleSystem/particleLifeSpanVariation) property.

The default value is `1.0` seconds.

You can animate changes to this property’s value. See [Animating SceneKit Content](/documentation/SceneKit/animating-scenekit-content).

---

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