I just want to know what is happening. When I was using McAfee in my office, it was possible to configure when and how often update is performed and in a simple textual update log was easy to find whether new database was installed or there was nothing to update or update failed due to communication problem.

With avast I wasn’t able to see if check really happened so it seemed to me that updates are pereformed in strange random way.

OK, I will accept as a fact which I can’t verify that updates happen every 4 hours.