//You need to run this in javascript console inside chrome

//Assumptions:
//1. Will count only "expanded" videos on page, you may first need to run script to scroll to last video or do it manually
//2. Tested on chrome, ubuntu, 2019
//3. Time format:   hh:mm:ss

var array = document.getElementsByClassName("style-scope ytd-thumbnail-overlay-time-status-renderer");
var arrLength = array.length;

var allHours = 0;
var allMinutes = 0;
var allSeconds = 0;

for (var i=0; i<arrLength; i++) {
	var content = array[i].textContent;

	// console.log("content: ", content);

	var splitedTime = content.split(":");

	if (splitedTime.length == 1) {
		allSeconds += +splitedTime[0];
	} else if (splitedTime.length == 2) {
		allMinutes += +splitedTime[0];
		allSeconds += +splitedTime[1];

	} else if (splitedTime.length == 3) {
		allHours += +splitedTime[0];
		allMinutes += +splitedTime[1];
		allSeconds += +splitedTime[2];
	} else {
		console.log("WTF error, current content:", content);
	}
}

var seconds = allSeconds % 60;
var minutes = (allMinutes % 60 + allSeconds / 60) % 60;
var hours = allHours + allMinutes / 60 + allSeconds / 3600;

// console.log("allHours:", allHours);

// console.log("allMinutes:", allMinutes);

// console.log("allSeconds:", allSeconds);

console.log("Hours:", hours);

console.log("Minutes:", minutes);

console.log("Seconds:", seconds);

//comments leaved for future fast debugging in case of errors, I know, bad practice
//Example page: https://www.youtube.com/user/DNewsChannel/videos