RejZoR
2
Use my avast! External Control program to change intervals (avast! Tweaker function).
You can choose from every week,every 2 weeks,every 3 weeks or once per month. You cannot change on which day because even avast! itself doesn’t have such feature. Maybe in some next release. If you know exactly what do you want and how should this feature work,give a note to wishlist with detailed description.