Well, 72 minutes but lets not split hairs...
New to Tableau, or maybe you are transitioning from an alternate tool. Sure there are plenty of training sites and materials, all designed to teach you to death!
The following videos will teach you everything you need so you can get on with your work in the quickest time.
Once you have covered these basics, head on over to the Show me how to build that page, to see how the majority of charts can be put together in under 60 seconds.
You can watch the videos here, though I would recommend you to download for offline viewing (and sharing if you think they're good enough 
)
1. An Introduction to Tableau (00:09:23) Here I shall demonstrate:
| 2. An Explanation of Aggregate vs Non-Aggregate Calculations (00:07:45) The bread and butter of Tableau, knowing how (and why) Tableau aggregates data will help you to better understand calculations, and the most likely use cases for each type. | 3. Calculations (00:15:30) Demonstrates the three calculation types with use-cases:
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4. Other Major Objects (00:10:52) A general overview of the vastly overlooked yet equally powerful (and arguably more important):
By using these built-in functions, you can vastly improve overall performance without the need to execute (often poorly) formulated calculations | 5. Series Conclusion: Your First Dashboard (00:28:53) Walk-through building your first dynamic dashboard (the one below) using the following skills covered in this series:
Also demonstrates:
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Series Conclusion Companion Workbook:
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Download the workbook here: Companion Workbook