(Reuters) - The first thing the 1,000 or so new post-IPO Facebook millionaire employees might need: a reality check. Financial advisers who cater to entrepreneurs and others who find themselves trading Chinese takeout for caviar say new millionaires rarely think rationally early on. "It will probably take three to five years to absorb the full impact," said Susan Bradley, founder of the Sudden Money Institute, a Florida-based organization that coaches the newly wealthy and their advisers. ...