Extending the timeout of users logged in via forms authentication in ASP.NET

I'm having trouble with a secure portion of my website logging users out earlier than I would like. I assume the default value is still in place, despite my attemepts to change it. I'm using a pretty basic method of forms authentication to validate users.

I have the following in my web.config:

<sessionState mode="InProc" timeout="60"/>

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and

		<authentication mode="Forms">
			<forms name=".ASPXFORMSDEMO" loginUrl="http://www.mysite.com/login.aspx" protection="All" path="/secure" timeout="60" defaultUrl="~/secure/index.aspx" slidingExpiration="true"/>
		</authentication>

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What do I need to do to extend the session for the users once they are logged in?