Cultural shocks are incurred by structured institutional changes and its a long process. Roots of a cultural shock are traditional patterns of customs and norms. Aftr every 50 kilometer worldwide you shall face at least at minor cultural shock. Its not possible to integrate different cultural norms in short span of time but requires generations. Fortunately modernization had influenced the convergence of cultures dramatically and reducing the time required for a cultural shock placement. So be ready for shocks when you are on a tour, its not a big deal though.