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Depends on how many wheels you have. 4 wheels might only take 2 hours to master shifting. 18 wheels might take over 2 weeks to get decent at it. Semis require double clutching that only involves tapping the clutch. Downshifting is way different on a semi too. Semis also take off from a stop without touching the accelerator whereas a car would stall. So it depends on what type of vehicle you're talking about.How many hours does it take to learn how to drive a stick?