timer.js

define(function() {

    var Timer = Class.extend({
        init: function(duration, startTime) {
            this.lastTime = startTime || 0;
            this.duration = duration;
        },

        isOver: function(time) {
            var over = false;
       
            if((time - this.lastTime) > this.duration) {
                over = true;
                this.lastTime = time;
            }
            return over;
        }
    });

    return Timer;
});