In a way I did it for Stack Overflow. All Posts are 60GB which is a bit too much to handle the whole chain in my desktop-pc. So I only used questions and answer

In a way I did it for Stack Overflow. All Posts are 60GB which is a bit too much to handle the whole chain in my desktop-pc. So I only used questions and answers with a score >=10 there to get it to a similar size as the other sites. It still took half an hour to parse the XML and another hour to create the chain.