Agree with David that the timeline is the difficult part to get a feel for, and that timeline will depend to some extent on where you live. I wish I knew if I should focus on my career or just do bare minimum.

In other news, I found this really insightful video about exponential growth yesterday. Definitely worth a complete watch or you've never seen it as I think it's the basis for a few writers here on Medium:
https://youtu.be/kZA9Hnp3aV4