[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Time](https://evolu.dev/docs/api-reference/common/Time) › Duration

```ts
type Duration = DurationLiteral | Millis;
```

Defined in: [packages/common/src/Time.ts:400](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Time.ts#L400)

[DurationLiteral](https://evolu.dev/docs/api-reference/common/Time/variables/DurationLiteral) or [Millis](https://evolu.dev/docs/api-reference/common/Time/variables/Millis).

Convenience input accepting a human-readable [DurationLiteral](https://evolu.dev/docs/api-reference/common/Time/variables/DurationLiteral) or
validated milliseconds as [Millis](https://evolu.dev/docs/api-reference/common/Time/variables/Millis). APIs normalize it to `Millis`.

### Example

```ts

const readableSchedule = spaced("1s");
const validatedSchedule = spaced(Millis.orThrow(1000));

assertType<typeof validatedSchedule, typeof readableSchedule>();
```