[CentOS] Delaying systemd reboot for a while

Hi,

I'm in need of rebooting a server 1 minute after I give the command. I'm
used to

shutdown -r +1


which works as advertised. Now that shutdown is part of systemd
<http://www.freedesktop.org/software/systemd/man/shutdown.html> and it is
actually a link to it in CentOS 7, I've seen in the documentation
<https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/sect-Managing_Services_with_systemd-Power.html>
that I can also use

systemctl reboot


But I can't find a way to provide a time specification in this latter form.
What's the correct incantation?

TIA,
Carlos.