1 hour = familiar (heard of it) 10 hours = proficient (1 day) 100 Hours = "good" (2 weeks) 1000 Hours = "expert" (6 months)
Although a general rule of thumb (that is true) is 3 months of full time work on a topic makes you "conversant"--good enough to pass yourself off as an expert to the unsuspecting. OF course, YMMV.
A while back I started learning the guitar - having learnt drums and (some) piano as a child with a teacher and structured learning, I decided to teach myself at a much slower process for 'fun'. I'm probably somewhere between the proficient and good categories now and I think this trajectory matches my experiences.
What is an important take away for people is that you can learn something, and it doesn't take that long for you to get to a point where it is useful, enjoyable and satisfying. So many adults shy away from learning new skills unnecessarily. Learn to play guitar. Learn to code. Learn to paint, learn to speak Dutch, learn to write poetry, learn to bake, learn to woodwork. Your life will be richer for it.