According to the IMO International Maritime Organization, an aluminum can takes between 200-500 years to dissolve at sea.
http://www.imo.org/Environment/mainframe.asp?topic_id=297
Paper takes a few weeks but most of the paper we use is chlorinated. And plus metal and paper fetch the highest market value.
Really Dorothy, who gives a shit? Take a tube of Vagisil, squirt some in your palm and rub until the irritation goes away. That comment you made early hasn't won you any loyalty. IMO, you're worse than the garbage you're so concerned about being dumped in the ocean.