Whenever I have new components or capacitors or cables to burn-in, I just go to Youtube and search for "burn in tracks". There are actually many, they are free to use, some of them are very long (more than an hour) and they work. I try to alternate those with pink noise and it really does help the bur-in process.
I suppose it can be beneficial to play those tracks every once in a while just to "remove the dust".