Memtest will run forever if you let it. Generally, to see if I have good memory or not I'll let it do five or six passes, or I'll let it go for 24 hours if I'm stress testing. More experienced people ...
But I'd question the wisdom of running memtest86 in a VM. By definition, VMs don't have access to all the memory in order for memtest to test it, and there are no guarantees about which parts of ...
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