Hey Jona
Thanks to @jeroends fabulous efforts, it really is that easy
Time updates isn’t done within VelServ, it’s handled by the openHAB2 bridges. (or OpenRemote / HomeAssistant etc)
If you open the bridge in PaperUI, you’ll see a “Show More” section.
In there is the time update interval.
That said, Jeroen has created a standalone VelTimer app if you want a separate Velbus system time update.
Useful links for anyone finding this thread in the future