---
title: "MotionDurationScale"
description: "Provides a duration scale for motion such as animations. When the duration [scaleFactor] is 0,
the motion will end in the next frame callback. Otherwise, the duration [scaleFactor] will be
used as a multiplier to scale the duration of the motion. The larger the scale, the longer the
motion will take to finish, and therefore the slower it will be perceived.

## Testing

To control the motion duration scale in tests, create an implementation of this interface and
pass it to the `effectContext` parameter either where you call `runComposeUiTest` or where you
create your test rule."
type: "interface"
---

<div class='type'>Interface</div>


<a id='references'></a>

<div class='sourceset sourceset-common'>Common</div>



```kotlin
interface MotionDurationScale : CoroutineContext.Element
```


Provides a duration scale for motion such as animations. When the duration `scaleFactor` is 0,
the motion will end in the next frame callback. Otherwise, the duration `scaleFactor` will be
used as a multiplier to scale the duration of the motion. The larger the scale, the longer the
motion will take to finish, and therefore the slower it will be perceived.

## Testing

To control the motion duration scale in tests, create an implementation of this interface and
pass it to the `effectContext` parameter either where you call `runComposeUiTest` or where you
create your test rule.


## Properties

<div class='sourceset sourceset-common'>Common</div>


```kotlin
val scaleFactor: Float
```


Defines the multiplier for the duration of the motion. This value should be non-negative.

A `scaleFactor` of 1.0f would play the motion in real time. 0f would cause motion to finish
in the next frame callback. Larger `scaleFactor` will result in longer durations for the
motion/animation (i.e. slower animation). For example, a `scaleFactor` of 10f would cause an
animation with a duration of 100ms to finish in 1000ms.



<div class='sourceset sourceset-common'>Common</div>


```kotlin
override val key: CoroutineContext.Key<*>
```