JavaScript) Youtube 재생목록 총재생시간 구하기

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var times = document.querySelectorAll('.style-scope .style-scope .yt-simple-endpoint .style-scope .yt-simple-endpoint .style-scope .style-scope span');
var duration = 0;
for(var i=0; i<times.length; i++) {
	var t = times[i];
	t = t.innerText;
	t = t.split(':');
	min = t[0];
	sec = t[1];
	duration = duration + parseInt(sec) + parseInt(min)*60;
}
console.log(duration/60/60);