SEP.cloud - definitions update frequency

SEP SBE Cloud Edition.

How frequently do clients check for definition updates ?

Do they just check several times a day  ? four times a day etc ?

Or are they constantly checking and pull downloads from the cloud as and when they are available proactively.

For instance could a SEP SBE Cloud Edition client pull multiple/many downloads per day ?

And can this in any way be configured either on the client itself or in the cloud portal ?

Or is this not possible to change the configuration, ie it just happens 24x7 automatically continiously.