When a preview is started, there is a delay before the preview is ready to be viewed. When a user clicks Start Preview, a page displays that counts down the time before it will redirect to the preview URL. If you viewed the preview URL page immediately, you would see non-test data (the regular site). The countdown page provides a transition while test data is being loaded.

By default, the preview countdown page displays for 60 seconds. You can change this time by editing the Configuration component in the /atg/abtest/web/ directory. Change the numberPreviewTimerSeconds property to the number of seconds you want the page to count down.