sum_free_egghead_video_length.js

var totalTime = $(".lesson-header")
    .filter(function(i, each) {
        return $(each).find(".pro-badge").length == 0;
    })
    .toArray()
    .map(function(each) {
        return $(each).find('.text-muted').text().match(/(\d+):(\d+)/);
    })
    .reduce(function(prev, curr) {
        prev.minutes += parseInt(curr[1]);
        prev.seconds += parseInt(curr[2]);
        return prev;
        },
        {minutes: 0, seconds: 0}
    );
var playbackSpeed = 1.5;
(t.seconds / 60 + t.minutes) / 60 / playbackSpeed;