> ## Documentation Index
> Fetch the complete documentation index at: https://docs.endstate.io/llms.txt
> Use this file to discover all available pages before exploring further.

# session.msUntilExpiry

> Milliseconds until expiry, or null when unknown. Never negative.

```ts theme={null}
msUntilExpiry(): number | null
```

## Example

```ts theme={null}
const ms = session.msUntilExpiry();
```