Im guessing from his post that he doesnt want to be logged in ALL the time, just for longer than default. He might use a computer that more than one person uses and he doesnt want them messing with his eGO account.
EDIT: AFAIK there is no way to change the timeout.
Oh, that button does it? OK, that's fine.
@Motorcycle: I actually clear out all cookies at browser close, so that's not a problem. It's just that, the timeout gets me every time.