schedule_summary.user.js

// ==UserScript==
// @name                    MKR Schedule summary 
// @author                  sergkh
// @namespace               sergkh
// @description             Tampermonkey script that shows hours summary for the MKR schedule
// @include                 *81.30.162.30/*
// @grant                   none
// @version                 0.0.2
// ==/UserScript==

(async () => {
  console.log('script successfully injected')
  
  const summaryDiv = (name, query) => {
    const el = document.createElement("div")
    el.textContent = `${name}: ${document.querySelectorAll(query).length * 2 } год`
    return el
  }

  const build = () => {
    var summary = document.getElementById('summary')
    if (!summary) {
      summary = document.createElement("div")
      summary.id = 'summary'
      summary.setAttribute('style', 'padding: 1em')
      document.querySelector('#content').appendChild(summary)      
    }
    summary.textContent = ''
  
    summary.appendChild(summaryDiv('Лекції', '.lesson-1'))
    summary.appendChild(summaryDiv('Практичні', '.lesson-2'))
    summary.appendChild(summaryDiv('Заочники', '.lesson-9'))
    summary.appendChild(summaryDiv('Екзамени', '.lesson-5'))
    summary.appendChild(summaryDiv('Заліки', '.lesson-6'))
    summary.appendChild(summaryDiv('Навчальна практика', '.lesson-13'))
  }
  
  setInterval(build, 500)
})()