Avast home doesn’t offer that option. You need Avast pro for it. (Hé there has to be a difference between free and paid :wink: )

But there is a workaround with taskschedular. Another user on this board has expalined how/what to do. Use the search function here to find it.

edit: found the thread that explains it.
http://forum.avast.com/index.php?board=2;action=display;threadid=3796