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.

Ivan

This plugin adds functionality to expire a post on a given date.
This plugin currently only works with the classical editor.
It does this by adding a new “Expires” date field in the Publish box.
By default posts don’t expire, but you can add a date instead.
Once that date is reached, the post is marked as expired and is no longer visible to the end user.
<h3>Dev Notes</h3>
<ul>
<li>Dev occurs via https://github.com/ivankruchkoff/wp-expiring-posts</li>
<li>the new post status is <code>expired</code></li>
<li>a filter called <code>exp_disable_expiration_for_this_post</code> exists to disable this feature on a per-post basis.</li>
</ul>

Expiring Posts

This plugin adds functionality to expire a post on a given date.

Password Protection Expiration vs Expiring Posts