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1) No. Tableau is not a real-time reporting application.
2) It depends:
2.1) If the connection to the data source is Live then the report will be updated whenever it is refreshed -- F5 if being viewed on the Tableau Server using a web browser.
2.2) If the report uses a scheduled Extract then the report will be up-to-date when its extract has completed.
Thank you very much Toby.