Tomek

This plugin show or hide the content after a specified time.
Example:
[timed-content time=”10000″ visible=”yes”]The content[/timed-content]

Timed content show or hide

This plugin show or hide the content after a specified time.

Rich Tape

Do you need to show or hide some of your content blocks to one or more users? The specific users add-on for Content Visibility lets you do just that.
Want to preview a change on an already-live page that only you can see? Make the new block only shown to you and the old block NOT shown to you. 
Does your colleague need to see a change before it’s approved? Uh huh! 
Want to leave yourself a note that only you should see? You got it. 
Want to show a form for one specific person so only they can fill it in? Yup. 
Hide or show any block for any specific user or users.
<h3>Development</h3>
Development is mostly done on <a href="https://github.com/richardtape/content-visibility-specific-users/issues/new" rel="nofollow ugc">github</a> and releases are made there and here to the WordPress plugins directory.

Content Visibility Specific Users

A Specific Users add-on for Content Visibility.

Timed content show or hide vs Content Visibility Specific Users