calculate youtube playlist duration

playlist.js

MINUTE = 60
HOUR = 60 * MINUTE
DAY = 24 * HOUR

timeToSeconds = (time) => {
	let base = 1
	return time.split(':')
		.reverse()
		.map(Number)
		.reduce((acc, val) => 
			acc + (val * Math.pow(60, base++))
		)
}

sum = (acc, val) => acc + val

total = 
	Array.from(document.querySelectorAll('span.ytd-thumbnail-overlay-time-status-renderer'))
		.map(span => span.textContent.trim())
		.filter(time => time !== 'LIVE')
		.map(timeToSeconds)
		.reduce(sum)

console.log('d', total / DAY)
console.log('h', total / HOUR)
console.log('m', total / MINUTE)
console.log('s', total)