Do speaker cables need a burn in period?

Burn them in at 110db with analog source only !
Just kidding. But use various music. Don't assume that they were fully burnt-in. Do you know how many people, not audiophiles, sell their new equipment because in fact it was not properly burnt-in and naturally they didn't like the sound !

Inna, are you suggesting I play my music quietly? I compete with low flying aircraft when i play my 'digital' music haha, I do have turntables, one is orf elsewhere (LP12), the other is still its box and not seen the light of day (MF round table), and the final one actually set up is a, wait for it......, a Music Hall USB-1 (stop laughing) for all those Goodwill vinyl purchases, of which I have bought many. lol.........

No, just play it any way you want to.
Low flying aircraft ? Hard to compete with. A few days ago there were a thunder and lightening over here and I thought - how can any audio system reproduce that ? Or record, for that matter. Crazy audiophile thoughts indeed.

IMO all audio equipment etc need a break-in (burn-in) period of time.

Your new running shoes will need more "burn" - oops! "break-in" than any speaker wire!