Hello Tom Miller,
When you check the Remember Me option of the ASP.NET Login control this generates a persistent cookie about your session. If you log in, then close the browser without logging out, and then reopen the browser you will still be logged in. If you click on logged out the cookie will be lost. Make sure that the browser does not clear all cookies and history on close. On a side note, i'd like to point out that the users will be logged out when they are inactive, if they are active the timer will always reset.
1. The default expire timeout value for the "Remember me" is 2 hours.
2.You can go to Administration->Settings->Advanced->Security- AuthCookieTimeout and change the default value.
I hope this helps, if any issues persist, please let us know.
the Telerik team
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