How long did I work on this? I don't remember exactly, I think I started late November or so, so it would be about 2 months and since it still needs perfection it will probably be 3 months in total. I sometimes wonder if all the things I do badly are not so clearly visible in the recording, because I'd never say it's awesome. My fingers can go fast, but in vertical directions, they are horizontally too static (so I have strange problems even with simple arpeggios, it comes out very uneven or there are many wrong notes).
I wouldn't say I'm an adult, but I don't think I learn very quickly, I know some younger people who progress incredibly fast. But there must be a difference between them starting the piano at the age of 8 or 10 and me at 17.
However, maybe if you're left with the music itself, without actually seeing me playing, the bad things like tense hands and wrong finger movements don't show that much. I played some easier pieces by Chopin (like preludes, nocturnes Op. 9) and I must say I practise, practise, practise and I still feel I haven't got into the musicality deep enough, even if the piece is technically mastered. For this reason some Haydn or Mozart sonatas may be easier for me (and the faster passages are usually very regular so if you work out how to play one bar you can play, say, 20 bars at once, and often you don't have this in Chopin).
I'll consider posting the Beethoven sonata when I think I'm more or less ready with it. However, I'm working on the 4th movement and I see it will definitely take a lot of time.