Capacitors take time to burn in, as do resistors. Also, copper wiring. This has been known since High End components were made, particularly in the 1980s, when High End components proliferated.
Just put the CD player on repeat 24/7. No need to have sound on; you're not burning in the amp or the interconnects, only the internal circuits in the component itself. If it were wiring, or an amp, speaker cable or speakers, you would need to have signal going thru it at around 70db or so. How long it takes is something you would inquire of the designer.