In the evening I turn off my computers (cut the power) and the next morning when I restart NixOS it reboots after about 4 minutes and then if I reboot during the day no problem.
Problem only at the first start in the morning.
ā systemd-analyze
Startup finished in 12.519s (firmware) + 4.498s (loader) + 2.595s (kernel) + 4min 21.865s (userspace) = 4min 41.478s
graphical.target reached after 6.468s in userspace.
What takes 4min 21.865s minutes is my 4TB external drive.