system
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UPDATE:
Although probably not many forum members care about this (as seen from the lack of posts from devs), here is an additional update.
For the exclamation mark and “unsecured” over Avast tray icon to be displayed, the time that passed since the previous database was actually applied is not a variable.
I kept testing this issue, and after more than 48 hours since my previous database update, there is no “unsecured”.
So, Status Bar monitoring of “Virus definitions version” is NOT (effectively) related to time. What exactly might trigger the “unsecured” and the exclamation mark for this specific setting is still a mystery to me.