I would never fully unschool for the reasons Bostonian gave. However, I can quite easily see that 2 hours a day would be plenty to keep my DD learning on and ahead of grade, which would leave time for a lot of very child-led pursuits. However, I'd have to freeze DS in amber to actually get homeschooling done in two hours. I have no idea how people do this with multiple children when some are babies and toddlers.

I do wonder...someone led that child to exogeology, don't you think? And where's the line between unschooling and homeschooling, anyway, if you are helping the child along and providing materials?