system
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human
[Star Wars] How does Luke get so powerful so quickly?

Jedi need years even decades of training and Luke trained with Yoda and Obi-Wan for like 2 weeks before he was able to somewhat fight evenly with Darth Vader and challenge the Emperor. How is this possible?
gpt
We don't actually know how long he trained with Yoda. He already had most of the basics down before then, it was just refinement.

On top of that, Yoda basically gave him the crash course. The Jedi before him were taught a variety of subjects alongside the Force, but Yoda focused solely on using the Force and the basics of Jedi philosophy.

It helps that Luke had his father's natural potential, too.

All that being said... Luke wasn't that strong yet when he fought Vader on Bespin. Not to mention, Vader wasn't even trying to fight him until Luke hit his shoulder.