// module.exports = function (callback) {
//     var start = Date.now();
//     setImmediate(function () {
//         var took = Date.now() - start;
//         return callback(null, took);
//     }, 0);
// };
module.exports = function (callback) {
    var start = Date.now();
    // setInterval is handled after setImmediate and setTimeout handlers
    var interval = setTimeout(function () {
        clearInterval(interval);
        var took = Date.now() - start;
        return callback(null, took);
    }, 0);
};