There are two parameters that determine the frequency of signature/definition updates:
The frequency with which each antivirus vendor releases an update
The configuration setting on your MetaDefender Core or MetaDefender Kiosk installation that specifies the time interval between system checks and applying new updates.
Most of the antivirus vendors release definitions at least once per day. Many release multiple daily. Some vendors release updates on weekends while others do not.
If you use OPSWAT's online update mechanism to apply updates (i.e. via direct internet connection) then you can configure the update interval to suit your needs. The default setting that comes with a new installation of MetaDefender Core or MetaDefender Kiosk is every 1440 minutes (once per day).
If you are using manual updates (aka offline updates) the frequency is controlled by how often you download and apply the offline update package from OPSWAT.
This article pertains to MetaDefender Core v3
This article was last updated on 2017-12-21