That’s kind of a subjective question. Some people are able to understand and pick things up quickly but others have a more difficult time. I used to do a lot of traditional pen and ink drawings when I was younger, then I started using CAD programs and 3D modeling programs, which were all very easy for me to learn and become proficient with them. But then came Zbrush, and it took me ages to learn it. In fact, even after years with the program, I still struggle with it.
So to answer your question, I would say it depends on the individual and his/her ability to wrap their head around this crazy program. Lol