Ends Skype Web calls after X minutes. Tested on Chrome.

EndWebSkypeCallAfter5Mins.js

// ==UserScript==
// @name         EndWebSkypeCallsAfter5Mins
// @namespace    http://tampermonkey.net/
// @version      0.3
// @description  Ends Skype Web calls after 5 mins
// @author       K
// @match        *://*.web.skype.com
// @match        *://web.skype.com
// @grant        none
// @run-at       document-end
// @updateURL    https://gist.github.com/kishorepv/2b71b2ed149fa319226be5139e76b81b/raw/
// @downloadURL  https://gist.github.com/kishorepv/2b71b2ed149fa319226be5139e76b81b/raw/
// @supportURL   https://gist.github.com/kishorepv/2b71b2ed149fa319226be5139e76b81b
// @source       https://gist.github.com/kishorepv/2b71b2ed149fa319226be5139e76b81b
// ==/UserScript==

var DEBUG = false;
var EVERY_X_SECS = 20;
var CUTOFF_MINS = 3;


function check_for_element() {
    var st_numeric = `div[data-text-as-pseudo-element^='${CUTOFF_MINS}:']`;
    var st_minutes = `div[aria-label^='${CUTOFF_MINS} minutes']`;
    var st_endcall = "button[aria-label='End Call']";
    var els = document.querySelectorAll(st_numeric);
    var btns0 = document.querySelectorAll(st_endcall);
    if (DEBUG) {
    var els20 = document.querySelectorAll(st_minutes);
    console.log(els.length, els20.length, btns0.length);
    }
    if (els.length >= 1) {
    var btns = document.querySelectorAll(st_endcall);
    var els2 = document.querySelectorAll(st_minutes);
    if (btns.length == 1 && els2.length == 1) {
    console.log(`Matching timer elements: ${els.length} and ${els2.length}, Matching 'End Call' buttons: ${btns.length}`);
    console.log(els, els2, btns);
    btns[0].click();
    }
    }
}

(function() {
    'use strict';
    console.log("Started 'EndWebSkypeCallsAfter5Mins.js (v0.2)' ... ");
    setInterval(check_for_element, EVERY_X_SECS * 1000);
})();