Hello Colin Bowern,
By default, the expiration time is set to 30 min in the application web.config file. You can easily change this value to increase the page timeout by modifying the timeout attribute:
<forms name=".ASPNET" loginUrl="~/sitefinity/login.aspx" protection="All" timeout="30" path="/"/>
Another option is to use the ‘Remember me on this computer’ checkbox when you are logging in. This will keep your session alive until you close the browser.
the Telerik team