12-11-13: SimaoI agree with Mustang also, as implied in the last line of my earlier post.
Agreed with Mustang. You're talking 3 feet for signals traveling close to light speed.
However, the fact you cited that signals propagate through wires at near light speed has nothing to do with it. Resistance, inductance, and capacitance, and their potential effects, are all directly proportional to length. Skin effect, dielectric absorption, antenna effects, impedance mismatch effects, effects related to purity of metals, and other such effects that some would argue can be audibly significant are also affected by length.
On another note, I would add to Mustang's comment that EVEN IF there is a difference (which I doubt), as explained in my earlier post there is no reason to necessarily expect that using two 3-meter cables would sound better than using one 3-meter cable and one 2-meter cable. It could just as easily sound worse.
Regards,
-- Al