Tracy,
Bo Jangle’s advice is probably as good as any, but you might want to consider the following:
The only person that needs to provide an answer to your question is the seller.
However, if your question is how long would it take you, as the buyer, to get the place properly registered, I would guess that most people on here would give you the same advice; i.e. tell the seller to get the place registered and then you will consider buying the house.
Would you purchase a property in your home country, if you knew that the property was not registered ? If your answer is no, then why would you consider buying an unregistered property in a foreign country ?
Never forget caveat emptor. Let the buyer beware.