How long for IC cables and Power Cords to break in


I recently replaced all my interconnects, power cord for my power amp, and a Monster power center. The first pass in listening did not produce any real improvement. I shut the system down for about a week to let the wife watch her "Swan" and "American Idol". Then I turned on the system last night. Suddenly everything sounded different. Brighter, more detailed, wider sound stage, bass powerful.

Do wires break in themsleves as long as current goes through them or is there a rule of thumb as to how many hours before one reaps the benefit?

System- B&K reference 4420 power amp
B&K PT3MK2 preamp
Adcom 600 CD
Vandersteen 2CE sigs
XR interconnects
Siganl cable power cord for the power amp.
Thorens 160 c with Linn basik arm and linn K5 cartridge. (Goldring 1012 on the way to replace the Linn K5...
eagleman6722
90% of the speed of light -- that's how long it takes for the first signal to go through your cable.
Rsbeck, but to the signal traveling at 90% the speed of light, won't the light ray look like it's speeding away from it at 100% the speed of light? Heheh.

I need a further explanation using superstring theory.
For what it is worth, the power cords I use (Chris VH DIY) took about 50-60 hours before they settled down and the sound stopped changing.
My interconnect is mostly Purist - with the burn-in CD, they still took about 100 or so to settle in. YMMV
Rs,
Speed of light before photones were defined as a propagation of EM waves through the air During Maxwell.
Through metals EM waves propagate much faster.
Figure that the speed of light isn't a limit!
"If you were driving your car in outter space at the speed of light and you turned your headlights on, would they do anything?" -- Steven Wright