Is 'burn' or 'break-in' time when it comes to solid state electronics/speaker cables simply a psycho-acoustic phenomena or does something physical actually happen to make the sound 'better'?

I'm auditioning some anti-cable interconnects and speaker cables on my system (Magnepan MG12's, Jolida hybrid amp) and though a bit bright sounding, overall I am quite pleased.
But the literature accompanying them suggests a minimum of 200 and up to 500 hours of 'break-in' time.
Can someone help or at least offer their opinion?

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