---
title: settlingDuration
framework: quartzcore
role: symbol
role_heading: Instance Property
path: quartzcore/caspringanimation/settlingduration
---

# settlingDuration

The estimated duration required for the spring system to be considered at rest.

## Declaration

```swift
var settlingDuration: CFTimeInterval { get }
```

## Discussion

Discussion The duration is evaluated for the current animation parameters and may not the same as the duration. The following code creates a spring animation with a duration of 2 seconds. let spring = CASpringAnimation()

spring.keyPath = "position.x" spring.fromValue = 0 spring.toValue = 640 spring.damping = 5 spring.duration = 2 With a damping coefficient of 5, the settling duration is approximately 2.85 seconds: the animated layer bounces around the target position several times before settling. However, changing the damping property to 15 reduces the settling duration to just over 1 second: the animated layer quickly comes to a stop as it reaches the target position. All of the spring animation’s physical attributes: damping, initialVelocity, mass and stiffness, can affect the settling duration.

## See Also

### Configuring Physical Attributes

- [damping](quartzcore/caspringanimation/damping.md)
- [initialVelocity](quartzcore/caspringanimation/initialvelocity.md)
- [mass](quartzcore/caspringanimation/mass.md)
- [stiffness](quartzcore/caspringanimation/stiffness.md)