I don't remember exactly, but on average:
It took 5-6 hours to generate the file with keysubtructer.
-rw-r--r-- 1 root root 180900000067 May 12 23:20 200.txt
Booting with keyhunt took about 3 hours.
/0/4 processor Intel(R) Xeon(R) Platinum 8370C CPU @ 2
/0/6 memory 64GiB System Memory