I have encountered a similar issue, but in my case I was having a message like shutting down services… remaining time n Seconds… and it stayed there taking long time shutting down.
But I can see in your case it says “Reached target system Opwer off.” I understand this is the last stage. This looks strange to me.
Anyway, our friends here guided me to use the ALT-Print Screen with REISUB buttons. (search for it here). What it does is gracefully “powering of” your machine, a “cleaner” and safer way to force your machine power off. Restarting -> stop job for user running!
I remember I saw a thread here where some suggested doing some modifications in some files to reduce wait time while shutting down. Sorry, I can’t remember where here in the forum.