Furutech GTX NCF receptical break in, how long

Will do audiolab, had some time to kill on road this morning and called furutech dealer I bought from. He said at least 6 week burnin and it is normal for it to swing like this even with 450 to 500 hours. Loss of bass etched highs. Last night the highs were almost the worst I've heard during this process, like broken glass. He also mentioned these outlets are very system dependent on how they react. He builds his statement power conditioners with these NCF's outlets so he has to have some experience and feed back from customers. Will try 12 and 12, what a crazy hobby!

Paul, I have experienced that harsh broken glass sound as well at times where I thought it was burned in.  It is also like some evenings it sounds okay but the next day it will be really bad and un-listenable.

What do you think is actually happening during this "burn in" process that would explain the purported sound changes?

Outside audiophile lore, I've never heard any electrician or electrical engineer (who isn't selling high end audio products) say any receptacles need "burn in" for any reason.

So I'm wondering what the actual technical reason would be for this "burn in" phenomenon and why it would alter sound.

(In my own experience, I've never heard a difference whether I've changed the outlets where my equipment was plugged in, including moving to a new dedicated outlet, or whether it's plugged in to my Furman power conditioner/bar). 

^^^ +1  

Ah, the curious, probing mind of the audio skeptic. Why do receptacles need burn in? Why do cables need burn in? Why do fuses need burn in? Why do capacitors need burn in? Why does contact enhancer need burn in? Why, why, why?! Sweet mystery of life. Why do the stars go on shining? Why do the birds go on singing? 🤡