Node read time

Reading time is a module that provides an extra field for content types, which displays to the users the time it will take for them to read a node. This field takes into consideration all the textfields part of the content type, plus entity reference revision fields like Paragraphs, Custom blocks etc.
It also comes with a configuration page, where you can:
– activate the reading time field for specific content types;
– set the “words per minute” value, which is part of the calculation of the reading time;


Source: https://drupal.org/project/project_module/feed/all