no i think its 10 years? as an aside, California is reportedly considering taxing people who worked here and then moved.... working in Cali and driving a couple hrs and retiring in Reno, NV is not uncommon and NV does not have state taxes.
I really don't think the garden variety millionaires can afford to live in Monaco. The cost of living is outrageously expensive. You are a nobody there unless you have at least a decent size yacht.