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

```ts
function addDelay(
  extra: Duration,
): <Output, Input>(
  schedule: Schedule<Output, Input>,
) => Schedule<Output, Input>;
```

Defined in: [packages/common/src/Schedule.ts:723](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Schedule.ts#L723)

Adds a fixed delay to the schedule's existing delay.

### Example

```ts
// Add 500ms to each delay
const slower = addDelay("500ms")(exponential("100ms"));
// Delays: 600ms, 700ms, 900ms, 1300ms, ...
```