Seth Yoder

When you password-protect a post in WordPress, a cookie is set to expire in 10 
days which prevents the user from having to enter the password during that 
10-day period. This plugin allows you to easily change the lifetime of that 
cookie.

Password Protection Expiration

Allows you to easily change the lifetime of the WordPress cookie which allows automatic login to password-protected posts.

ramon fincken

Auto deletes expires (prunes) posts or pages after a certain amount of time. On a per category basis (single category, or all at once). 
Handy if you want to have posts with a limited timeframe such as offers, coupons etc.. 
Posts will auto delete on a per category basis: single category OR all categories at once. 
All (custom)post types are supported. (CPT support) 
Will also trash post attachments. 
Sends notification to site admin (can be turned off). 
No cronjob needed 🙂
<ul>
<li>Coding by: <a href="https://www.mijnpress.nl" rel="nofollow ugc">MijnPress.nl</a> <a href="https://mastodon.social/@ramonfincken" rel="nofollow ugc">Mastodon profile</a> <a href="https://profiles.wordpress.org/ramon-fincken/" rel="nofollow ugc">More plugins</a></li>
<li>Idea by <a href="https://www.nostromo.nl" rel="nofollow ugc">Nostromo.nl</a></li>
</ul>
Donate <a href="https://donate.ramonfincken.com/" rel="nofollow ugc">https://donate.ramonfincken.com/</a>

Auto Prune Posts

Needs to be updated; too many errors thrown. Hopefully this will be attended to as it's a really useful plugin otherwise.

Throws errors on activation.

Auto deletes expires (prunes) posts after a certain amount of time. On a per category basis (single category, or all at once.

Password Protection Expiration vs Auto Prune Posts