Two years is reasonable, but certainly better than average. Especially if you don't yet have kids, and if you will enjoy doing it for its own sake, certainly achievable. You'll need to do something pretty much every day for two years.
The fact that you couldn't sell it is laughably ridiculous. Pick up any issue of Trade-a-Plane and look at how many Van's planes are for sale. Homebuilts are bought and sold all the time, and if you had a Kitfox to sell today, it would probably be sold tomorrow. It is true that there is no bulletproof way to insulate yourself from post-sale liability, as if someone sued you, it would ultimately be up to a court to decide. However, the practical reality is that this doesn't happen. EAA has not heard a single reported instance of an amateur builder successfully being sued.
If you do decide to buy one, line up everything you need in advance. Make sure the funds you intend to use are liquid, know who will do your prepurchase inspection, how much insurance will cost, how you're going to retrieve it, etc before you even start looking. When you see the perfect plane, you will need to literally be on the phone the moment you see the posting, or it will be someone else's.