Do cables need to be re-broken in?

Bob Crump of TG Audio broke in all cables and power cords for 30 days on M.O.B.I.E. prior to shipping. The presumption is that cables or power cords NEVER break in 100% just playing music through them, not even in ten years. Maybe not even 80%.  Please, no angry PMs.

I know my house wiring hasn't broken in it takes 10 seconds to long to cook my oatmeal. 

Hi,
no, only let gravity do the work. A cable must sit and take a form.

It takes 381/2 hours for re break in.

Burn-in aside, mechanical stress with new or used coiled-up cables was a factor with most of my Cardas interconnects, and a few others tested over decades. Just letting them sit plugged in and relaxed for 10-14 days, not moving them and letting them rest did result in different results with sound too. More noticeable in transparent systems primarily. Makes little to no difference in less transparent systems or low grade metallurgy and no dielectrics used in cheap cables - still sounds grainy regardless of time, YEMV. 

According to George Gardas:
http://www.cardas.com/insights_break_in.php