How many years after the land ownership transfer to real owner to the person who using?
If you are referring to the doctrine of adverse possession, the time varies among jurisdiction from 5 years to 60 years. However, the most typical period is considered to be 20 to 30 years. Thus, one has to consult with a lawyer for clarification.
Are you talking squatter's rights (otherwise known as the doctrine of adverse possession)? It varies by jurisdiction, so you would need to consult with an attorney.
You sure have a way with words. What was the question?