Bookmarklet source code to calculate the length of a series on Laracasts.com

laracasts-series-time-calculator.js

// Bookmarklet created using http://chriszarate.github.io/bookmarkleter/
var time = $('.running-time').map(function () {
    return $(this).text().replace(/([^0-9:]+)/gi, '').split(':').reverse().reduce(function (prev, curr, i) {
        return prev + curr * Math.pow(60, i)
    }, 0);
}).get().reduce(function (a, b) {
    return a + b
}, 0);

function format(time) {
    var hora = ~~(time / 3600);
    var mins = ~~((time % 3600) / 60);
    var secs = time % 60;
    var ret = "";
    if (hora > 0) {
        ret += "" + hora + ":" + (mins < 10 ? "0" : "");
    }
    ret += "" + mins + ":" + (secs < 10 ? "0" : "");
    ret += "" + secs;
    return ret;
}

alert(format(time));