# displayDurationInMilliseconds()

Displays a length of time in milliseconds.

## Signature

`displayDurationInMilliseconds (Duration duration)`

## Parameters

***duration*:** Type: `Duration`. The duration object returned by `$A.localizationService.duration`.

## Returns

**Type: `number`** The length of time in milliseconds.

## Sample Code

```javascript
var dur = $A.localizationService.duration(1, 'hour');
// Returns 3600000
var length = $A.localizationService.displayDurationInMilliseconds(dur);
```

**See Also**

- [duration()](/docs/platform/aura-platform/guide/ref-jsapi-auralocalizationservice-duration.md)