gistfile1.js

var casper = require('casper').create();

var journeystage = 'ProductPage';
var journeytimings = Array();

casper.on('load.started', function() {
  journeytimings[journeystage] = new Date().getTime();
});

casper.on('load.finished', function(status) {
  starttime = journeytimings[journeystage];
  endtime = new Date().getTime();
  journeytimings[journeystage] = endtime - starttime;
});

casper.start('https://www.google.co.uk');

casper.run(function() {
  this.echo('Time taken ' + journeytimings[journeystage] + ' ms');
});