In my opinion, as long as your ears aren't bleeding, I would just let them burn in naturally over time instead of knocking yourself out. If you are determined to burn them in, you should list the cable maker in your post, since burn in time will vary among the different makers and their own particular cable model.
Another Cable Burn-in Question
I've checked the archives and I'm still not certain about this. I want to burn-in a new ic cable between CD player and preamp. I set the CD player to repeat/play but does the preamp need to be turned on? I'd rather not leave my tubed pre on during burn-in if I don't have to.