That kind of abuse for weeks at various combinations of high voltage (one high vcore, one high vPLL, one high vTT, one high all etc) should of course be tested for resultant degradation, by trying to run the cpu at default speeds at default voltages. Also, if you know the cpu's previous stable overclock (ie: 4GHz @ 1.304v stable) whether or not the cpu can still perform as stably as it did previously when overclocked should also be verified using a stress test like linpack, not just verifying that they run. I assume you intend to do this?
Just running them flat out and waiting for one to fail is not really conclusive in that degradation will not be demonstrated, only final failure will be demonstrated with long term, constant abuse. Common sense tells us that that will happen anyway. It is (or should be IMO) the quantification of the degradation and the speed of the degradation process that should be of most interest. Also, by using multiple cpu's, each cpu with only a single voltage set high (ie:only vcore, rest stock) as Dinos22 suggested, will allow elucidation of exactly what degradation effect each voltage has.
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