Beware of the cable claiming long burn in period.

To get back to "listening for 500 hours'.. well YEAH, if you plug in the cable and press play... I would think playing them to break them in is 'listening to the for 500 hours of break in'. For my recent experience the worst was the near endless break in of the pile of Furutech AC duplex GTX-D NCF Rhodium. The up and down ride for months.. (partially/completely? due to my buying a few then more then more over two months.) was annoying, gratifying and then back to annoying. So I can sympathize with folks stuck with Morrow! If I had any advice about Furutech Rhodium GTX-D NCF??? Buy them COOKED!   
I am glad it is over.. NO more breaking in anything for me.. for awhile..

It’s a little bit dangerous IMHO to ascribe up and down changes of break-in or even *any* changes over a period of time due to the fact that most audiophiles are continually adding, changing or deleting cables, equipment, room treatments or tweaks, not to mention all the other variables that affect sound. - day vs night, day of the week, weather, and things that uh, go bump in the night. 

Sadly Geoff, sometimes, a few of us actually stop changing anything. For months!!! Even years!!!! Seems impossible, but true. 

There’s one in every crowd. 😬