I mean, I'm not in shape for it, but maybe by the end of a week I might be? (or completely incapable of walking and already on the train home. It seems like it'd probably be one or the other. And if I can't do the 40 miles to the first train station in a week... well, I will have learned something.)

The last time I backpacked I had my weight down to about 15 pounds dry, including clothes and shoes. It would probably have to be a little heavier on this trip, but still under 20 pounds, and I wouldn't have to carry more than a few pounds of water. I would not be comfortable and would hate it by about the second hour of the first day, but so far my pack experience has been that the only way through is through, and I've done pretty substantial city walking with packs that weight that were all books. :D