How many reps?

It’s said seven repetitions is sufficient to retain something.  I’ve seen that 30 is the magic number.  Some insistence regards 3000-5000 repetitions to be the magic value. (this pertains predominantly to muscle memory) When does this apply to music?  When does a song, within the first few bars, sear permanently into your brain?  At how many listens does it become part of you?  At what point does it start to change you, and mold you into a evolved being?  When does the veneer crack and the feeling seep in?  How many pressings does it take to feel?

For me just one.

Please though, take many.  I know I have done so.

Humbly yours,

J