How come it takes more than a minute to shutdown or reboot the system?

As far as I remember you have to configure something.
Give me a minute please.
Here [Tip] Enable Magic SysRq Key (REISUB)
I hope this helps.
Let me know how it goes with you.
Just to update you:

I am on BTRFS by the way.
I noticed much faster boot time with dracut + systemd-boot.