So ...

Upon activation, go to Settings => Reading Time WP to access the settings page:

You can ...

• define the text that will appear on screen for reading time

• select the minutes

• "adjust" the reading speed (300 words per minute by default)

If you don’t want to automatically display the estimated reading time for all your posts, then you'll have to uncheck the "Insert Reading Time before content" and "Insert Reading Time before excerpt" checkboxes. In this case you can use the plugin-generated shortcode to display the estimated reading time on given posts.

So let's see the magic ...