Speaking theoretically starting from Tokyo-eki with a ¥200 ticket, how long could you theoretically stay "in-the-system" without leaving through a single fare-gate or ticket booth--in essence "live in the JR-East system" (not specifically Tokyo-Eki or any other single station)?
Just to make it fun, I've added a poll. For even more fun, let's see if someone will actually try it ^_^