Yes pages do time out. This is done for security reasons. After you have been in a page for 25 minutes and not been active on the page you will receive a warning that the page is about to time out, however, you will be able to extend your time on the page. After the third warning on a page you will  have to move to another page.
If the page times out after the third warning will the information that I have entered be saved or will I have to start all over again?
Thank you. Will I be able to start a new session and complete the information if it has not been saved?
You will be able to start using the Retirement Estimator again. You will,  however, have to check if you are eligible to use the Retirement Estimator.