I dont think anyone truly masters the guitar because there is always new things to learn. Rhythm, cords and scales are all a big part of learning to master the guitar. It takes lots of practice and hard work. You can also take into consideration how generally “naturally gifted” you are. By that I mean how quickly you took up the basics of finger placement and chord transition.
Some take 2 years to become what most would say good, others may take 5 or 6. It really depends on the individual.
I think the most important factor that comes into play with how well you play guitar (as with any instrument) is how much you practice. It definatly should be daily, probably for at LEAST an hour.
But it’s also important not to wear yourself out and get frustrated. I say practice and play daily for a year before you decide if guitar is right for you.
If you need help mastering the guitar I suggest an online guitar guru by the name of Ben Edwards. He’s well educated and has a great online course to teach newbie to advanced students.
