A year, lol. That's like someone saying I'm going to go train for a year and then win an MMA championship. I think it might have been longer than a year.
Well you'd be wrong.
It was canonically a year.
Just like Luke canonically went from barely able to pull a lightsaber out of a pile of snow to being able to levitate multiple rocks and supply cases + R2D2 telekinetically while standing on his head and balancing Yoda on his foot in the few weeks he was on Dagobah.
Just like he canonically instinctively picked up the basics of Form V just from dueling Vader once.
Luke is canonically the most powerful and fastest learning Jedi of all time.