Speaker cable length with monoblock amps?

I had Kimber make me some 1' silver cables when I had a pair of mono amps. The idea that speaker cables have to be a certain minimum length strikes me as an audiophile myth; I've never read any EE theory supporting the idea. Real short cables can always be used as jumpers on speakers having two sets of binding posts (for bi-wiring).

What price levels of monoblocks and cables are we talking about? At high level you should not worry too much about resale value.

@inna $15k a set speaker cables and $22.5k a pair amps, your point being? Yes I could have them (SR) make me up a set of short cables for $10k but who wants to pay this much for jumpers? 

As another poster suggested one option to a “free” set of cables is to buy a 10’ set, have it cut and reterminated and sell the remaining 6’ as a clean set. AQ is a really good brand to do this with as they will change up any of their cables at cost (although personally I have never liked the AQ speaker cables)

buy 2 short runs of zipcord - test that - blind - vs. something cheap from BlueJeans cable

take the winner and test it vs. various brands from one of the rental places (i.e buy & return)

on the other thread, I agree you want to listen to the Vidars

$15k/$22.5k cables/amps proportion is not what I had in mind.
In any case, as I suggested above, one must be able to tell the difference between 2' and longer cables. And the difference should be real not something bordering non-existant. It will also depend on speakers. There is no general answer. If someone is concerned with resale, yeah, not shorter than 6', if not - listen. And if auditioning is not possible and there is no-one to advise in the paricular case - 6' is probably most reasonable. Personally, I never really think of the resale value. I upgrade rarely and if after ten years I'll have to throw away an amp I paid $5k for - so be it, that's less than $50 a month. I think about performance and try to get the most of it for the least money, after that business is over and listening to music is in order.