What is the default length of a session timeout in Safari?

The default session timeout is Safari is 20 minutes. To clarify, if you are looking at a page for a period over 20 minutes, you will be logged out automatically. This will happen even if you are scrolling up and down within that particular page. To prevent that from occurring, you must hit the refresh button to restart your session. The timeout can also occur if you have multiple windows open to use Safari. If one is idle for over 20 minutes, your session will timeout regardless of your activity in your other window.