It's very strange that it's taking so long.
What specs did you give to the VM (CPU, RAM)?
Is the VM located on SSD or HDD disk?
It's on an HDD. I also installed another VM from a 'russian torrent tracker' that had Big Sur before and it booted in less than 1 minute on HDD but it had terrible performance, thats why I wanted to try this one.
Specs:
EDIT: I also made a VM using a physical Hackintosh High Sierra (drive passthrough) with OpenCore and boots fine.
EDIT 2: Tested one with Catalania from same source and also boots fine.
This is what I added to those VMs to be able to boot, else I would get stuck on Apple logo. Yours boots without those anyway.
Code:
cpuid.0.eax = "0000:0000:0000:0000:0000:0000:0000:1011"
cpuid.0.ebx = "0111:0101:0110:1110:0110:0101:0100:0111"
cpuid.0.ecx = "0110:1100:0110:0101:0111:0100:0110:1110"
cpuid.0.edx = "0100:1001:0110:0101:0110:1110:0110:1001"
cpuid.1.eax = "0000:0000:0000:0001:0000:0110:0111:0001"
cpuid.1.ebx = "0000:0010:0000:0001:0000:1000:0000:0000"
cpuid.1.ecx = "1000:0010:1001:1000:0010:0010:0000:0011"
cpuid.1.edx = "0000:0111:1000:1011:1111:1011:1111:1111"
EDIT 3: I give up. I don't think yours will make a huge performance difference (even the High Sierra VM with an SSD passthrough to it work horrible) and I should try to get a modern Hackintosh working instead if I really want to make something in the system. I can get access to a GT 720 1GB and is supposedly compatible with at least Catalina; will try with it.
Thanks anyway.