by Robert Coster on WordPress.org
Calculates and displays estimated reading time for posts with configurable speed and flexible display options.

Reading time displayed at the top of a post
Signalfire Reading Estimator automatically calculates and displays the estimated reading time for your posts and pages. This helps visitors gauge how long content will take to read before they begin.
Use [sigukrest_reading_time] to display reading time for the current post, or [sigukrest_reading_time post_id="123"] for a specific post.