The third answer is more practical than theoretical. For a simple example, consider learning to skate or ride a bike. Most kids persist in falling down, scraping knees and elbows, and sometimes even breaking bones because they want to learn to skate or ride. If they give up for a time, they may return to it later when it becomes more important to them. If not, maybe it just isn't that important after all.
Children also learn from watching their parents.
Again, it would depend on your situation, your children, your state, your needs, whether or not your kids have been in school, etc. It may take a lifetime, or you may find a rhythm tomorrow that suits you. Unschooling comes down to relaxing and letting go of your expectations. It's simple, but it's certainly not easy. The difficult part is, no one can really tell you how to do it for your family.