[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:186](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Time.ts#L186)

Duration can be either a [DurationLiteral](https://evolu.dev/docs/api-reference/common/Time/type-aliases/DurationLiteral) or milliseconds as
[Millis](https://evolu.dev/docs/api-reference/common/Time/variables/Millis).