How much must be earned in a life time

How much must be earned in a life time to live in paradise? Take an average 4 roomer two kids family. In his life time he must spend these money other than the normal living expenses. His flat will cost him $500k or more when fully paid up. His Medisave that he cannot touch will be at least $30k. His two kids, if lucky enough to get into university locally, total cost for each upon graduation