One more thing, be prepared to be hungry at work. Not just a little hungry. The kind of hunger that makes you eat a second breakfast when you get in and yearn for lunch by 10am, then a second lunch by 2pm. 80 miles/day will require an extra 2000+ calories. On day one, you'll probably have that in reserve so it'll be no big deal, but by your second week, you'll be foraging all the time.