Is there a minimum length for power cords?

With respected manufacturer MIT there are plain and networked cables of 2 meters. My licensed electrician friend said that to say the shielding is not effective for a short length of power cable is ludicrous.

@Yping: FYI, 2.5 meters is eight feet.

I have a 3ft Tara labs cobalt power cord, To my amusment, I sent Tara a E-mail asking about length of this model, Their answer?, The 3ft cobalt will have more resolution period than a 6ft cobalt power cord., that was their answer, However, I can tell you with 515 hours of burn-in that I have now, This power cord is not at all forward sounding, it's presatation is ideal, nor is it recessed, evadently, power cords seem to be different than say, a real short speaker cable where the sound does become forward, as far as speaker cables, I like 6ft speaker cable sound., cheers.

I bought longer than needed MIT Oracle PC's. I have been "so" grateful for the flexibility provided.The bit of extra length-on occasion-has "never" been even the least consequential--but it has been very revealing/informative/satisfying to be able to experiment due to having a bit of slack. Isn't that a common request.. to cut one some slack.

IMO, no sonic difference with unshielded cords (1m - 5m).