> For the complete documentation index, see [llms.txt](https://docs.hiveauth.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hiveauth.com/developer-documentation/has-for-applications/challenge/expiration.md).

# Expiration

It may come that the App never any reply to its request from the **HAS**.

There can be many reasons for this like users not starting their **PKSA** or not approving or refusing challenge requests they receive.

The **APP** should monitor requests' expiration against the `expire` timeout provided in the `sign_wait` message. They should abort the challenge process and discard pending requests as well as any related reply they may receive.