Once the board(s) are sitting in front of me each one takes no more than a few minutes. Personally I pull all transformers, heat sinks, anything I see that has copper with channel locks. (I also pullthe power switch for a very small piece of silver). I then with a old chisel and hammer pull off the ics. The process takes no more than 5 minutes a board. Can usually process 100-120 boards if I have the supply. As far as a hammer mill I think it would make a mess. you would have everything shredded. Copper and aluminu lm mixed with everything else and no real way to separate the good and bad. Plus the yard you take it to may have a problem with all the powder that is not magnetic. You would have to then disose of that which would be taking away from the original weight. You might have to just get your hands dirty and tear them apart manually. Just my two cents.
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