RemoveYouTubeAutoplay.user.js

// ==UserScript==
// @name         Remove YouTube Autoplay
// @description  Disables the Autoplay feature on YouTube videos
// @version      1.1.6
// @author       heavyLobster2
// @namespace    github.com/heavyLobster2
// @downloadURL  https://gist.github.com/heavyLobster2/4f20db397e4ca84161e7/raw/RemoveYouTubeAutoplay.user.js
// @match        *://www.youtube.com/*
// @grant        none
// @noframes
// ==/UserScript==
(function () {
    "use strict";
    
    function removeAutoplay() {
        var autoplay;
        autoplay = document.querySelector(".autoplay-bar");
        if (autoplay) {
            var toggle = document.querySelector(".autoplay-bar #autoplay-checkbox");
            if (toggle && toggle.checked) toggle.click();
            autoplay.remove();
            var sidebarSeparator = document.querySelector("hr.watch-sidebar-separation-line");
            if (sidebarSeparator) sidebarSeparator.remove();
        }
        autoplay = document.querySelector("ytd-compact-autoplay-renderer");
        if (autoplay) {
            var toggle = document.querySelector("ytd-compact-autoplay-renderer #toggle");
            if (toggle) {
              	if (toggle.wrappedJSObject) toggle = toggle.wrappedJSObject;
                if (toggle.checked) toggle.click();
            }
            autoplay.remove();
        }
        autoplay = document.querySelector("div.ytp-autonav-toggle-button");
        if (autoplay) {
            if (autoplay.wrappedJSObject) autoplay = autoplay.wrappedJSObject;
            if (autoplay.getAttribute("aria-checked") === "true") autoplay.click();
        }
        var annoying = document.querySelector("ytd-mealbar-promo-renderer");
        if (annoying) { annoying.remove(); }
    }
    
    var observer = new MutationObserver(function (mutations) {
        removeAutoplay();
    });
    observer.observe(document, { subtree: true, childList: true});
})();

Can you make scripts that set a timer to automatically pause/stop on all Youtube embed videos? Like pause a video after X seconds!!?