A whole week? Even the biggest novels top out at around 1000 pages. The fattest single-volume mass-market paperback novels I have seen other people actually reading are King's _It_, Michener's _Hawaii_, Mitchell's _Gone With the Wind_, and Rand's _Atlas Shrugged_. Those might last the whole week, if you spent most of it napping.

That said, I recommend it be done on a sandy beach or on a hammock rather than the couch, and at least once per year, rather than once per lifetime.