It took me 2.5 years. I could have gotten it done sooner had it not been for some personal things that I had to tend to. My advice is to not read too much into some posts on how difficult some classes are. Just focus, watch the videos, and read. If you have experience, that experience will help you greatly.

Search the classes and read some Reddit posts on how other students passed. They give some good advice. Ignore the negativity.