How often should I complete a full scan. I do a full scan daily. This won't hurt the system will it. As far as I can tell it just takes up time.
You should do a full scan once a week. One should note that, every AV has a real time protection, so any threats that will be lurking on your PC will be detected by the real time protection.
So when one has real time protection active and it is running in background from start of PC till it's shutdown, there is no need to do a full scan everyday.
(Bitdefender beta tester 2019/ 2020)