Ah, sorry I thought I was in the DAVdroid forum… With ICSdroid you can always set the minimum interval that you need for one calendar, the others only get updated when there are changes on the server so there is no unneeded traffic. See here because we’re often asked about it:
Feature request : add time of last successful sync
Can you add the time of the last successful sync ?
Because right now we only know of the time of the last sync, successful or not.
It can be usefull if the server is down, and you don’t know who of you or your friends has the last updated calendar.