A set of underscore mixins for timer functions.

underscore.timers.js

_.mixin({
    bindDelay: function(func, context, wait) {
        return _.delay(_.bind(func, context || this), wait, _.last(arguments, 3));
    },
    
    bindDefer: function(func, context) {
        return _.defer(_.bind(func, context || this), _.last(arguments, 2));
    },

    repeat: function(func, interval) {
        var args = _.last(arguments, 2);
        return setInterval(_.bind(func, null, args), interval);
    },

    repeatForDuration: function(func, interval, duration) {
        duration = duration || 500;
        interval = interval || (1000 / 60);

        var args = _.last(arguments, 3),
            timer = setInterval(_.bind(func, null, args), interval);

        _.delay(function() {
            if (duration % interval == 0) func.apply(null, args); 
            clearTimeout(timer);
        }, duration);
        return timer;
    }
});

repeatForDuration will repeat a function on an interval and stop after a defined duration.