Consider that floor plan of average shoe box is nearly or about one square foot.

For about a week's worth of camping I used a Mountain Hardwear solo tent, now discontinued, that had a fairly similar design to SD Light Year, but slightly heavier. For about six months' worth of (discontinuous) camping I've used the (also discontinued) SD Divine Light, which is smaller.

I found both these tents very cramped. Also, many solo tents are too heavy compared with many 2-person tents. The Light Year, in my opinion, is borderline. I looked at one in a store once, and was somewhat put off by weight and bulk considering its size.

For summer conditions, a lot of people might do well with the somewhat larger Wenzel or similar coated pup tents. http://www.campmor.com/outdoor/gear/Product___35842

These cost $30 new, offer full flooring and netting (unlike tarps), and if you ditch the poles, are roughly same weight as one-person tent.