Here's a picture of me from the back as well to show everywhere that I shaved. It took me almost exactly one hour to shave it all, pretty much everything from below my eyebrows on my front half and below my back hairline on my back got shaved.
Truthfully, if I could easily get all the hair I removed shaving on this dare removed permanently, I would. It'd certainly save me a lot of time shaving (and the occasional waxing).
I usually shave my genitals, my legs, my chest, and my arms regularly, so I didn't think that just adding in my back and butt would really change things to get up to shaving everything from the neck down.
But it's weird how it did. Usually since I'm only shaving sections at a time, I'm having to keep shaving cream only in the section it should be in at that time. This time I ended up just covering all of me at once in shaving cream and working from there.
Since I often also shave my face when I'm shaving most of my body, I shaved that as well this time. Then since pretty much the only skin that wasn't going to get shaved was the back of my neck, I added in that as well just a bit below the hairline. The only hair on my body that survived was my eyebrows and my scalp.