Snap lxd 4 on fresh bionic bare metal host.
The only thing running during that time is
$ systemctl list-jobs 468 snap.lxd.daemon.service stop running
It doesn’t matter if i manually lxd stop all containers prior to shutdown now -r or reboot command.
Modified /etc/systemd/system.conf but this did not help either, still 10min.
[Manager] ShutdownWatchdogSec=1min DefaultTimeoutStopSec=20s