my yahoo email session lasts about an hour- why?

I used to leave my mail session open for a month at a time. Now I'm lucky if it stays open an hour before I get the "login again" prompt. Why is this happening? I've switched from Mozilla to IE, but that was only a temporary help. Can't yahoo see how long it's been since I logged in?

Anonymous2010-08-28T22:36:47Z

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SOMEONE PUT A CODE AND CHANGE YOUR SETTINGS, HOW OLD ARE??? MAYBE YOUR PARENTS IDK