@Animisha and @Josephine I think I reach the stage where a piece becomes a part of me only after playing it a lot (and I don’t mean practicing it a lot), combined with recording or performing it for others, and also after learning it, polishing it, forgetting it and then bringing it back again.
I don’t think it has to do with how long someone has played in general, but more about how someone has interacted with that specific piece.
Although, in the contest of this thread, then maybe the question is, would memorizing a piece speed up that process, or would one still have to go through some of those other steps? I don’t know…