In Wayland session, restart is taking 1min which is probably a timeout, it could be systemd issue or SDDM?
This is SDDM, well known issue, fix is in upstream git, but no stable release yet with the fix, ongoing discussions as to why no release yet.
Workaround for now is to log out of the Wayland session, then restart from SDDM, then you will have no delay.
If you don't want to wait, you can switch to the tty which is running SDDM, it will close it automatically.
So habitually, CTRL + ALT + F1