# multiply

Multiply the current state of a RefDuration by a number.

## Signatures

```ts
export declare const multiply: {
    (that: number): <E, R>(ref: RefDuration<E, R>) => RefSubject.Computed<Duration.Duration, E, R>;
    <E, R>(ref: RefDuration<E, R>, that: number): RefSubject.Computed<Duration.Duration, E, R>;
};
```

## Why

Multiply the current state of a RefDuration by a number. The operation remains attached to the
RefSubject's versioned state boundary.

## Ownership and lifetime

The multiply view retains no independent state. An Effect read samples the source once; Fx
observation follows later pushes and its observing Scope owns subscription cleanup.