Do speaker cables need a burn in period?

all the new cables I have purchased came with a 30 day return period, and since burn in takes only a week or two, that was never an issue...and all the manufacturers said they would allow more time if needed...

I question whether it's the new cable that's burning in or is it the listener getting used to them?

Here we go again.....

At the very least a few hours of not being moved. 
Never heard anyone report cables sounding worse after a few hundred hours.

At least a week after cryo. When comparing cables at least two days.