So for 4 years I'll be at a job that requires me to do nothing lol, so I"m hoping how feasible and effective it will be to mentally practise only, since I will have almost no time to have contact with my dear piano. I plan on drilling scales, harmonies, chords, and visualize notes, and musical pieces into my head. I'm not sure to what extent I'll be able to improve my rather mediocre pianistic skills with this (been playing for a year), assuming even that it will actually help. And what can I expect from this, will it be better than 4 years of actual keyboard practise, or worse. I know that there are too many factors involved, but I have been hearing that mental practise is much more effective (when done properly) than actual practise with the piano. What are your thoughts on this, and I appreciate whatever advice you can give, or ideas that I can incorporate into my mental practise routine, or even how futile my efforts will be. I'm willing to overwork myself to death (I actually enjoy it, the headache that I get from 3-4 hours of MP feels pleasurable like going to the gym), but only if I'm informed beforehand that the efforts will pay off eventually.