paperleaf

Welcome to TimeSpan
The plugin ships with default settings, but allows you to change everything from: the message shown for a post that will take less than one minute; the message shown for any post over 1 minute; and the words-per-minute used to calculate the reading time.
Setup
Once the plugin is activated, you have two options: you can include it in your theme files (handy for WordPress developers), or you can let us do all the heavy lifting with automagic setup.
Include TimeSpan in Your Theme Files
<ol>
<li>Head over to the TimeSpan menu under Settings</li>
<li>Fill out the options on that page</li>
<li>Place the ‘echo do_shortcode(‘[time-span]’)’ shortcode wherever you’d like the data to show up in your theme file (e.g. page-home.php).</li>
<li>Click the blue “Save Changes” button.</li>
</ol>
That’s it!
Automagic Setup
The Automagic Setup will automatically insert the calculated time to read at the top of each of your posts. Here’s how to do that:
<ol>
<li>Head over to the TimeSpan menu under Settings</li>
<li>Fill out the options on that page</li>
<li>Check the box at the bottom labeled “Automatically insert the time to read at the top of Posts”.</li>
<li>Click the blue “Save Changes” button.</li>
</ol>
That’s it!
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TimeSpan

TimeSpan is a simple, easy to set-up WordPress plugin that automagically calculates the approximate length of time it will take to read a blog post.

brianmcculloh

A very unobtrusive and light-weight reading progress bar indicator showing the user how far scrolled through the current post or page they are. You can control placement and color of the progress bar, and you can choose whether it includes just the main content or also the comments.
The progress bar only displays once the user begins scrolling the page so it is as unobtrusive as possible. Once the user stops scrolling or scrolls down past the content the progress bar subtly mutes until it is needed again.
There is also a reading time commitment feature that you can separately enable. Control the placement (above or below title, or above content), style, and whether it displays on posts and/or pages. Uses 200wpm as the metric for average reading time.
You can also place the time commitment label anywhere you want via the [wtr-time] shortcode.

Worth The Read

Looks very promising, but on my site, nothing was added.

Absolutely does not anything :(

An adjustable progress meter showing how much of the post/page the user has scrolled through, and a read time commitment label near the post titles.

TimeSpan vs Worth The Read