I have see that other antivirus, for example Antivir PE, has an update process more fast, Avast update the signature 2 day at week. There is the possibility that in future the update can be don daily basis?
For example now the update are stopped to 12 july… and the viruses grow 
Bye.
If a new threat appears, an avast! update is released very soon.
For adding rare viruses (i.e. those you never meat anyway), however, it doesn’t really matter if the database is updated once a week or 3 times a day.