videos = $$('.pl-video .timestamp');
videos = videos.map(v => v.innerText);
sum = 0;
for(video of videos) {
    video = video.split(':');
    const videoTime = parseInt(video[1]) + (parseInt(video[0])*60);
    sum += videoTime;
}

std = Math.floor(sum / 3600);
sum -= std * 3600;

min = Math.floor(sum / 60);
sum -= min * 60;

s = sum;

console.log(`${std}h ${min}m ${s}s`);