User:It's moon/common.js

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const numWords = $( '#mw-content-text > div' ).text().split( ' ' ).length;
const headerWords = $( 'h1' ).text().split( ' ' ).length;
const totalWords = numWords + headerWords;
const timeInMinutes = totalWords / 200;
const header = $( 'h1' ).text();
$( 'h1' ).text( header + ' (it will take you ' + timeInMinutes + ' minutes to read this page)' );