Many good and valid points have been noted on this thread.
I would like to add that with speakers / components it is the drivers and the capacitors that take the longest time to break in. Some of the more exotic caps take a very long time!
Cabling/wire breakin, as baffling as it may seem does take about 200 hours, although as previously noted the initial sound when new doesn’t change significantly after that time. However, I have had a few exceptions...
To me, speaker cabling should have some power driving through them. With interconnects, just a signal is enough.
Of course this is my opinion from experience.
ozzy