how far can one turn down a crank?

Cope said
My buddy had some hack build him a motor (500 CI) and it spun a rod bearing right out the gate....
He gave me the crank. It's a forged 440 source 500 cubic inch stroker.
It don't look to bad, I would like to know haw far I can have it turned before it's junk?

Should I have all the journals turned or just the one?

Thanks again for all your time and advice.
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Measure the rod journals to see if they are Mopar size 2.375 or Chevy size 2.200. Once you know that then you can look for bearings. You can turn the crank to whatever you need to as long as there is a bearing that works.