Dunn, I think it might depend on the browser that you use. From personal experience, once I log in with Google Chrome, then I'm logged in for good. With Internet Explorer, I have to log in anew every day. With IE, as long as I *don't* check the "remember me" box, then it remembers me, bizarrely enough. I keep my IE minimised so I don't have to go through repeated logging in during a day.
"Bleat, Watson -- unmitigated bleat!" ~ Sherlock Holmes