After logging into TutorPanel you will stay logged in for an additional 60 minutes after any activity. If you are being logged out sooner than this the issue is likely related to your browser.
If you are using Internet Explorer you can extend the amount of time you stay logged in by adding TutorPanel to your trusted sites.
In your browser, go to Tools->Internet Options->Security->Trusted Sites. Then click the "Sites" button and add http://www.tutorpanel.com.