We have all heard the axiom “A job expands to fill the time allowed.” This can be expressed differently: “Limit the time to do the work and the work may still get done.” One of the inherent flaws in the weekly lesson template we all use and grew up with is the lack of tight time limitation. If something is not mastered this week, there is always next week, or next month or even next year. This can be mitigated with recitals, festivals, and competitions. However, even with these, we still can put off our work until most of the available time is gone.
In my own playing, once I took my first church job which required me to have hymns, preludes, postludes, etc. ready every week without fail, I found my ability to learn a significant amount of music quickly an absolute necessity for survival. At first, I was not terribly successful and relied upon the art of “fake” more than I should have. But through the years there has been more “play” and less “fake”.