Temporary editor

I had an idea for a plugin: temporary editor

Frequently, I want to be able to allow someone else to edit to their hearts content a single page

I wanted to know is there a ‘temporary editor’ creator plugin anywhere?

The idea would be to give someone a username and password – this would only be valid ofr X time 9 say 2 hours or 24 hours for example

After this, the temp Editor ID would jut get deleted

This would be really useful to have

I thought it would be fairly easy to use WP’s session control?

Is there anything out there that does something like the above?

Thanks

Omar