Avast screen saver

Say, i use the avast screen saver, which scans the computer when it’s in screen saver mode, does the scan pick up where it left off the last time the screen saver was on(with the computer on the whole time without booting) or does it just start the scan over every time the screen saver goes on? Thanks for any replies. ;D

It starts from the point where it was interrupted the last time.