Does the same algorithm work for long-term maintenance of tasks that require practice or revisiting as for facts?

If I practice a song on the piano every day until I have 100% accuracy and get it to a level of fluency I like, what is the maintenance schedule to keep it there? Is it the same as a "fact" put into long-term memory? How would one measure such a thing? What about something like math fact fluency? Does it require daily practice forever, or will you hit a ceiling of competence after which you are wasting time (like with my Anki/Supermemo/Quizlet experiment) reviewing daily? And if you don't need daily practice, what is an appropriate schedule?

I can't help thinking there must be certain fundamental principles with memory that would apply to physical skills like this in the same way. I have "practice Hypernova by m-flo" as an Anki card as a sort of experiment. I definitely have lost fluency on the song with the infrequent reviews, though. Perhaps a modified/more frequent schedule is needed for physical tasks? Again, how would a good/efficient schedule be determined, one that maintains the skill without overpracticing?

I think task scheduling might only be a different animal in the initial learning phase.

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