Conversation so far:
When did Ramzan Kadyrov become Deputy Prime Minister?
After his father, then President, was assassinated on 9 May 2004, Ramzan Kadyrov was appointed as the First Deputy Prime Minister of the Chechen Republic on 10 May 2004.

Question: How long did he serve as Deputy Prime Minister?
Self-contained rewrite: How long did Ramzan Kadyrov serve as Deputy Prime Minister?