FortiEMS cloud upgrade - downtime?

Hi all,

completely new into FortiEMS or in generell into Fortinet.

Right now we are running on FortiEMS Cloud 7.2.5.1061 and would like to upgrade to the newest version.

Found this article:

https://community.fortinet.com/t5/FortiClient/Technical-Tip-How-to-upgrade-the-firmware-of-EMS-cloud/ta-p/216177

Unfortunately there are no informations about what time (only day) this will happen or something about how long this will take (will there be any downtime?).

Thanks, regards

Marc