I think it took me about 14 days total. That includes a night in Denver, Chicago, Vail and the drive time.
I like shiny expedition trucks as much as the next guy, but I also like to challenge myself as a driver, and see new things. If the 4runner had broken while I was out there, it would have gotten tricky. My original plan had me trailering out just in case that happened, but I scratched that idea, and just drove the hard stuff with my vehicles weaknesses in mind. Also I spent a significant amount of time making sure everything was squared away before we left so I wouldn't be replacing a tranny in a truck stop parking lot.
It was an amazing trip, and one of the first 'big trips' I've ever done. Its way easier than you think, take the time off work, load the car, and start driving!!!