It is now version 6.2.6 and methods get quicker so about 15 seconds after typing (your mileage may vary so do wait Minutes
as logging 23193884 bytes written to file
should give you a final message) note 44ppm is reasonable so 44pps (Pages Per Second) is blindingly fast.
Note for 64bit start with "C:\Program Files (86)\Mic...
for 32bit it is
"C:\Program Files\Microsoft\Edge\Application\msedge.exe" --headless --print-to-pdf="%userprofile%\Desktop\PDFfromCMD.pdf" --no-pdf-header-footer --enable-logging https://docs.jboss.org/hibernate/orm/current/userguide/html_single/Hibernate_User_Guide.html
[0428/035904.555:INFO:headless_shell.cc(659)] Written to file C:\Users\WDAGUtilityAccount\Desktop\PDFfromCMD.pdf.
For a specific earlier version replace current
with say 6.0 , to see the version list use https://docs.jboss.org/hibernate/orm/
I get current pages as a 763 Page PDF

For current 6.1.4 [updated] 6.1.8 hibernate_search_reference.pdf the pre-compiled version is at https://docs.jboss.org/hibernate/stable/search/reference/en-US/pdf/hibernate_search_reference.pdf
If you just want parts quickly from Asciidoc source download the zip as mentioned above and use the browser extension see https://stackoverflow.com/a/71181730/10802527