Hi! Sorry, I only speak English so my reply is going off of what Google translated for me:
Thanks!
Uhh.. everyone has a different skill level, excel at distinct things, and learn at certain paces... so there isn't really a definitive answer for "How long does it take to get that good?". I think one of the most important things is to work on what you're most passionate about, while also trying new things... also doing a ton of still life helps. (I don't think I'm the greatest person to be asking these questions to though haha)